diff --git a/inputs/day7.txt b/inputs/day7.txt
new file mode 100644
index 0000000..036d66d
--- /dev/null
+++ b/inputs/day7.txt
@@ -0,0 +1,1096 @@
+$ cd /
+$ ls
+dir brdsppd
+dir dnjqmzgg
+126880 fmftdzrp.fwt
+173625 hhfqgzfj.qvt
+dir lbbcfjl
+dir mzdqcb
+dir npppw
+dir plmb
+6337 rfgtcj.tdn
+dir szfw
+230140 vmc.cdf
+$ cd brdsppd
+$ ls
+dir gjc
+dir lcz
+218543 ndqmcv
+dir qnj
+dir rrdd
+dir zppsglq
+$ cd gjc
+$ ls
+dir bvctghh
+262132 cbczvmdf
+111855 dnltsq.fwv
+22416 fnrwscz.vwb
+dir gwd
+dir lsprzlbf
+$ cd bvctghh
+$ ls
+dir lsprzlbf
+dir lwfgnzz
+dir tjslbpb
+$ cd lsprzlbf
+$ ls
+182522 hhfqgzfj.qvt
+dir hts
+229288 jtpdh
+dir lwfgnzz
+284594 szfw
+89639 tgdsjl
+$ cd hts
+$ ls
+11158 dnltsq.fwv
+52582 tchv
+$ cd ..
+$ cd lwfgnzz
+$ ls
+dir tjslbpb
+$ cd tjslbpb
+$ ls
+58586 jtzmjgw.bql
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd lwfgnzz
+$ ls
+199598 rlhz.pbs
+$ cd ..
+$ cd tjslbpb
+$ ls
+119666 fmzfs.glg
+$ cd ..
+$ cd ..
+$ cd gwd
+$ ls
+dir bcfqd
+1631 hhfqgzfj.qvt
+$ cd bcfqd
+$ ls
+197168 cqvwnslp.ltw
+$ cd ..
+$ cd ..
+$ cd lsprzlbf
+$ ls
+dir jwznh
+$ cd jwznh
+$ ls
+dir lpm
+dir ncs
+dir vqprn
+$ cd lpm
+$ ls
+15172 bnw.rqm
+215818 flpbspn.stt
+$ cd ..
+$ cd ncs
+$ ls
+dir rzdbw
+$ cd rzdbw
+$ ls
+15150 cvjldjt.gdc
+$ cd ..
+$ cd ..
+$ cd vqprn
+$ ls
+23882 njjjh
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd lcz
+$ ls
+37587 gwcvttb.dhc
+195583 lsprzlbf.vng
+152648 tchv
+$ cd ..
+$ cd qnj
+$ ls
+dir bpvl
+275640 cfvznj.bqc
+dir lwfgnzz
+213007 nwbt.mct
+135231 twpf.pft
+165501 vmc.cdf
+88097 vmvs.hnr
+dir znbdpp
+$ cd bpvl
+$ ls
+dir nmzbpb
+$ cd nmzbpb
+$ ls
+129477 pjlvs.zcp
+$ cd ..
+$ cd ..
+$ cd lwfgnzz
+$ ls
+dir lwfgnzz
+dir rsbdcwjr
+dir sgh
+dir wvwmf
+$ cd lwfgnzz
+$ ls
+33186 ftcrfnmd
+$ cd ..
+$ cd rsbdcwjr
+$ ls
+dir lsprzlbf
+$ cd lsprzlbf
+$ ls
+dir jvcgnbs
+288445 pjmqm
+111585 szfw.drf
+dir vnftvqf
+$ cd jvcgnbs
+$ ls
+dir ctlwjnjz
+dir lwfgnzz
+dir tjslbpb
+$ cd ctlwjnjz
+$ ls
+72087 zmhnsmmf
+$ cd ..
+$ cd lwfgnzz
+$ ls
+151358 sqs
+$ cd ..
+$ cd tjslbpb
+$ ls
+112471 mftdzhwj.zvt
+$ cd ..
+$ cd ..
+$ cd vnftvqf
+$ ls
+120421 lsprzlbf.tqc
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd sgh
+$ ls
+228239 szfw.dzv
+$ cd ..
+$ cd wvwmf
+$ ls
+dir bcjfz
+$ cd bcjfz
+$ ls
+26284 bzhqwdjq.nzn
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd znbdpp
+$ ls
+dir szfw
+$ cd szfw
+$ ls
+dir nthzqpws
+dir snfmt
+$ cd nthzqpws
+$ ls
+96382 twhdbvtw.lbj
+$ cd ..
+$ cd snfmt
+$ ls
+133360 bjmgtpgh
+134215 vmc.cdf
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd rrdd
+$ ls
+185903 cpgpgntt.tfn
+$ cd ..
+$ cd zppsglq
+$ ls
+41689 jvcgnbs.hrt
+169754 wgnpq
+$ cd ..
+$ cd ..
+$ cd dnjqmzgg
+$ ls
+dir lsprzlbf
+dir lwfgnzz
+dir nmvj
+dir sfpg
+$ cd lsprzlbf
+$ ls
+dir lbw
+141416 sqs
+$ cd lbw
+$ ls
+48758 cjv
+235522 dnltsq.fwv
+$ cd ..
+$ cd ..
+$ cd lwfgnzz
+$ ls
+36709 bcmtmwcz
+$ cd ..
+$ cd nmvj
+$ ls
+dir dqpw
+dir tjslbpb
+$ cd dqpw
+$ ls
+10608 hhfqgzfj.qvt
+$ cd ..
+$ cd tjslbpb
+$ ls
+261140 qfzb
+$ cd ..
+$ cd ..
+$ cd sfpg
+$ ls
+8543 szfw
+69248 tjslbpb
+$ cd ..
+$ cd ..
+$ cd lbbcfjl
+$ ls
+dir csnjp
+dir drwpfn
+301956 hhfqgzfj.qvt
+dir jvcgnbs
+dir lsprzlbf
+dir pdzlnm
+161886 tchv
+153858 vmc.cdf
+87849 wghtg
+dir zhgchnld
+$ cd csnjp
+$ ls
+dir ffgfmcm
+dir gtd
+dir lbjvqv
+dir lwfgnzz
+11312 sqs
+$ cd ffgfmcm
+$ ls
+dir bcnvw
+dir lcf
+dir lsprzlbf
+$ cd bcnvw
+$ ls
+111692 ftcvs.tcz
+173665 jpfh.hrs
+120561 lwfgnzz.zvd
+dir ngtbzz
+29479 tchv
+dir tjslbpb
+$ cd ngtbzz
+$ ls
+dir czrqmh
+dir jrhpnpw
+dir lsprzlbf
+$ cd czrqmh
+$ ls
+225055 hhfqgzfj.qvt
+$ cd ..
+$ cd jrhpnpw
+$ ls
+206497 tjslbpb.zbv
+$ cd ..
+$ cd lsprzlbf
+$ ls
+66627 szfw.wtd
+$ cd ..
+$ cd ..
+$ cd tjslbpb
+$ ls
+dir cgzlp
+116060 lsprzlbf
+dir szfw
+128885 zht.ptf
+$ cd cgzlp
+$ ls
+18201 sqs
+$ cd ..
+$ cd szfw
+$ ls
+104128 tchv
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd lcf
+$ ls
+137662 lwfgnzz
+$ cd ..
+$ cd lsprzlbf
+$ ls
+151745 fmcgs.tvh
+37707 gszw.jlm
+dir lsprzlbf
+178133 rjw.wrq
+dir szw
+267875 tchv
+198852 vmc.cdf
+$ cd lsprzlbf
+$ ls
+54734 lsprzlbf.hcq
+81537 lwfgnzz
+120990 qppfdrf
+$ cd ..
+$ cd szw
+$ ls
+dir jtvschrd
+dir zcnpls
+$ cd jtvschrd
+$ ls
+dir gtz
+$ cd gtz
+$ ls
+dir rdzzlm
+$ cd rdzzlm
+$ ls
+55063 tchv
+8813 zfwvvpvz.zzb
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd zcnpls
+$ ls
+282808 dpmd
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd gtd
+$ ls
+148653 cmchsg.zdr
+66537 hhfqgzfj.qvt
+125493 mdtmqbml.gnt
+dir rwjdjqcs
+dir tjslbpb
+$ cd rwjdjqcs
+$ ls
+77026 zpt.gfp
+$ cd ..
+$ cd tjslbpb
+$ ls
+dir dfl
+$ cd dfl
+$ ls
+203731 qpsmsjgh.gvs
+dir tjslbpb
+84386 vmc.cdf
+dir zgh
+$ cd tjslbpb
+$ ls
+dir lwfgnzz
+140021 qnp
+312305 svh.vqt
+$ cd lwfgnzz
+$ ls
+49701 lgffdn.gmr
+$ cd ..
+$ cd ..
+$ cd zgh
+$ ls
+138627 tchv
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd lbjvqv
+$ ls
+dir bnl
+$ cd bnl
+$ ls
+dir gbv
+dir lwfgnzz
+$ cd gbv
+$ ls
+dir lsprzlbf
+36406 lsprzlbf.cfd
+$ cd lsprzlbf
+$ ls
+168615 hlhp.rvp
+$ cd ..
+$ cd ..
+$ cd lwfgnzz
+$ ls
+149511 cdpwjbpd
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd lwfgnzz
+$ ls
+232898 dnltsq.fwv
+181665 hhfqgzfj.qvt
+62529 qfmhhvvq.prh
+57822 sqs
+$ cd ..
+$ cd ..
+$ cd drwpfn
+$ ls
+dir fvgw
+dir lsprzlbf
+dir lwfgnzz
+104745 nqvlqd.mdb
+203189 qqpmz
+159549 tchv
+dir tjslbpb
+dir wnrns
+$ cd fvgw
+$ ls
+dir tlzmplfl
+$ cd tlzmplfl
+$ ls
+29740 vmc.cdf
+30062 wgrm.dst
+181738 zqr
+$ cd ..
+$ cd ..
+$ cd lsprzlbf
+$ ls
+dir lcqhctjl
+dir ldr
+dir tjslbpb
+$ cd lcqhctjl
+$ ls
+209114 bcfr.gpf
+$ cd ..
+$ cd ldr
+$ ls
+148649 fzh.pqm
+$ cd ..
+$ cd tjslbpb
+$ ls
+241013 dnltsq.fwv
+$ cd ..
+$ cd ..
+$ cd lwfgnzz
+$ ls
+288335 cdctnn
+67277 tchv
+$ cd ..
+$ cd tjslbpb
+$ ls
+dir pblzrspg
+dir qqgddb
+86103 sqs
+183539 tjslbpb.wrs
+$ cd pblzrspg
+$ ls
+dir pgl
+$ cd pgl
+$ ls
+305421 lwfgnzz.jdz
+114244 tjslbpb
+dir vzff
+$ cd vzff
+$ ls
+80591 rlww.htq
+86968 sqs
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd qqgddb
+$ ls
+dir szfw
+$ cd szfw
+$ ls
+dir jtw
+$ cd jtw
+$ ls
+263 szfw.lzp
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd wnrns
+$ ls
+203725 dnltsq.fwv
+77752 qrg.fnt
+$ cd ..
+$ cd ..
+$ cd jvcgnbs
+$ ls
+296356 lwfgnzz.svf
+294928 ptvdsngf
+$ cd ..
+$ cd lsprzlbf
+$ ls
+dir lwfgnzz
+dir tjslbpb
+$ cd lwfgnzz
+$ ls
+105095 tchv
+$ cd ..
+$ cd tjslbpb
+$ ls
+53558 hhfqgzfj.qvt
+189180 szfw
+$ cd ..
+$ cd ..
+$ cd pdzlnm
+$ ls
+76426 jwttcp.rjj
+dir lsprzlbf
+dir qldhzf
+dir rtdsjf
+dir sfdtljj
+69033 slhl.jst
+$ cd lsprzlbf
+$ ls
+71362 vgdr
+$ cd ..
+$ cd qldhzf
+$ ls
+303106 lsprzlbf.rbq
+$ cd ..
+$ cd rtdsjf
+$ ls
+45781 pzbgwrdm.lwt
+dir rzc
+$ cd rzc
+$ ls
+297081 qqvlp
+86015 zthlr
+$ cd ..
+$ cd ..
+$ cd sfdtljj
+$ ls
+254377 ftw.fwg
+dir jvcgnbs
+153393 lwfgnzz.dws
+dir pnphc
+220821 wslttcn
+$ cd jvcgnbs
+$ ls
+92642 bzpvvlsn.gvt
+$ cd ..
+$ cd pnphc
+$ ls
+288388 lwfgnzz
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd zhgchnld
+$ ls
+16588 ftgrpj.srl
+112044 vmc.cdf
+$ cd ..
+$ cd ..
+$ cd mzdqcb
+$ ls
+dir bfphcs
+dir cgjmj
+dir jgcqqsh
+dir jvcgnbs
+dir lccjbtqs
+dir lwfgnzz
+dir pprvjm
+dir szfw
+dir tjslbpb
+dir ztc
+$ cd bfphcs
+$ ls
+124148 wzt.qtr
+$ cd ..
+$ cd cgjmj
+$ ls
+28095 ddjdbdf
+dir jvcgnbs
+169536 sqs
+dir svbsrj
+159511 vmc.cdf
+$ cd jvcgnbs
+$ ls
+dir crmsnch
+dir jvcgnbs
+$ cd crmsnch
+$ ls
+195745 lsprzlbf.prh
+271424 tjslbpb
+227054 vmc.cdf
+$ cd ..
+$ cd jvcgnbs
+$ ls
+294249 vmc.cdf
+$ cd ..
+$ cd ..
+$ cd svbsrj
+$ ls
+49038 cspzcpqs
+dir czltsqrg
+98084 ljhljcw
+dir ntdjg
+202570 szfw.lpj
+$ cd czltsqrg
+$ ls
+207690 dnltsq.fwv
+208745 lnns.hsv
+40703 rgmjszf.vtd
+$ cd ..
+$ cd ntdjg
+$ ls
+dir szfw
+$ cd szfw
+$ ls
+284994 qzwptr.ggb
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd jgcqqsh
+$ ls
+2462 djfwggvp
+$ cd ..
+$ cd jvcgnbs
+$ ls
+dir ftjprdj
+289965 zhlrstpt
+$ cd ftjprdj
+$ ls
+dir wnmhs
+$ cd wnmhs
+$ ls
+dir tjslbpb
+$ cd tjslbpb
+$ ls
+dir jvcgnbs
+$ cd jvcgnbs
+$ ls
+160761 dnltsq.fwv
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd lccjbtqs
+$ ls
+dir jjrdbgtg
+77186 sqs
+116398 szfw.qjt
+182665 vmc.cdf
+248366 vqdjwsh
+$ cd jjrdbgtg
+$ ls
+237358 bdvbjs.sjp
+$ cd ..
+$ cd ..
+$ cd lwfgnzz
+$ ls
+dir ggptdvr
+dir jnb
+dir lcpmzpr
+222506 lsprzlbf
+293605 qbjfqh
+dir smvwg
+291643 tchv
+247095 vwdstb.pdw
+dir wghpmnm
+dir wtrbfrj
+$ cd ggptdvr
+$ ls
+184198 vmc.cdf
+$ cd ..
+$ cd jnb
+$ ls
+296536 dnltsq.fwv
+91419 jvcgnbs.cvq
+279635 rwt.wth
+$ cd ..
+$ cd lcpmzpr
+$ ls
+184769 hhfqgzfj.qvt
+dir qwqcbdms
+236533 tjslbpb.bnc
+162397 vmvctfnw
+dir wcc
+$ cd qwqcbdms
+$ ls
+232132 jgm.tfm
+dir jnfmcnfh
+173727 mwrbndt
+dir qshphcb
+dir tjslbpb
+$ cd jnfmcnfh
+$ ls
+dir rngnt
+$ cd rngnt
+$ ls
+236114 hhfqgzfj.qvt
+$ cd ..
+$ cd ..
+$ cd qshphcb
+$ ls
+78407 lsprzlbf.hpd
+$ cd ..
+$ cd tjslbpb
+$ ls
+30200 brbz
+171368 jvcgnbs.vwl
+236158 sqs
+285872 srfwnmb
+dir znr
+$ cd znr
+$ ls
+108194 hhfqgzfj.qvt
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd wcc
+$ ls
+167768 jvcgnbs
+289640 lgthn.cjn
+28517 lwfgnzz.chf
+dir nvgfwn
+43738 rrg
+81011 sqs
+$ cd nvgfwn
+$ ls
+270370 hgnv.ssj
+98235 lwfgnzz.nfv
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd smvwg
+$ ls
+dir jvcgnbs
+77510 tchv
+dir tgrm
+$ cd jvcgnbs
+$ ls
+287955 bqcnj.zzv
+119021 bsrtmzd
+3391 cnngp.mbf
+68540 qjmb.vjz
+149062 tchv
+$ cd ..
+$ cd tgrm
+$ ls
+112315 qzth
+277566 scqp
+$ cd ..
+$ cd ..
+$ cd wghpmnm
+$ ls
+dir hpm
+$ cd hpm
+$ ls
+113354 hhfqgzfj.qvt
+$ cd ..
+$ cd ..
+$ cd wtrbfrj
+$ ls
+dir ggrsgzvv
+dir mvzzsl
+dir szfw
+dir vsqjb
+$ cd ggrsgzvv
+$ ls
+dir dpv
+dir gqtsmnr
+dir lsprzlbf
+dir pcjcm
+137203 tchv
+84711 tns.sdh
+$ cd dpv
+$ ls
+233264 dmd
+dir fzlchpb
+293097 gwmspnm.qtp
+100283 jbbnssc.nnv
+$ cd fzlchpb
+$ ls
+150431 pdmzrs.rll
+$ cd ..
+$ cd ..
+$ cd gqtsmnr
+$ ls
+dir jdml
+dir jfqtjt
+dir lwfgnzz
+dir tjslbpb
+$ cd jdml
+$ ls
+148333 bwm.dnt
+dir lsprzlbf
+$ cd lsprzlbf
+$ ls
+dir cslvm
+dir lwfgnzz
+dir rllt
+265856 sqs
+dir szfw
+56452 tchv
+$ cd cslvm
+$ ls
+266380 vmc.cdf
+$ cd ..
+$ cd lwfgnzz
+$ ls
+dir tzghdrd
+$ cd tzghdrd
+$ ls
+dir tjslbpb
+dir vhv
+$ cd tjslbpb
+$ ls
+dir jvcgnbs
+$ cd jvcgnbs
+$ ls
+18188 sqs
+$ cd ..
+$ cd ..
+$ cd vhv
+$ ls
+95547 jhhblnn.vzt
+dir srgh
+$ cd srgh
+$ ls
+299624 lsprzlbf.dnr
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd rllt
+$ ls
+dir crpcbl
+308185 dnltsq.fwv
+dir szfw
+$ cd crpcbl
+$ ls
+209445 dfds.mzh
+$ cd ..
+$ cd szfw
+$ ls
+dir lsprzlbf
+159720 vmc.cdf
+$ cd lsprzlbf
+$ ls
+291090 tzrvpv
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd szfw
+$ ls
+113605 fbrtbfjm
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd jfqtjt
+$ ls
+119124 hhfqgzfj.qvt
+251412 jvcgnbs.zfm
+dir rbv
+dir tjslbpb
+142371 tjslbpb.czt
+65455 vmc.cdf
+47786 zjmtjsv
+$ cd rbv
+$ ls
+300632 dzssgm.pqn
+$ cd ..
+$ cd tjslbpb
+$ ls
+221545 pswrb.bsw
+$ cd ..
+$ cd ..
+$ cd lwfgnzz
+$ ls
+34086 wshbr.spm
+$ cd ..
+$ cd tjslbpb
+$ ls
+118394 djfwjd.fvl
+65377 qmgcpdr.qjz
+146317 tchv
+$ cd ..
+$ cd ..
+$ cd lsprzlbf
+$ ls
+195086 clqmgmq.gbw
+dir cpgjgbdf
+109787 jmwshtg.snl
+305108 lsprzlbf
+dir szfw
+174614 szfw.qjq
+105247 vmcf.rsm
+$ cd cpgjgbdf
+$ ls
+dir vzddwsr
+$ cd vzddwsr
+$ ls
+91787 nwgfs
+$ cd ..
+$ cd ..
+$ cd szfw
+$ ls
+193316 tjslbpb
+$ cd ..
+$ cd ..
+$ cd pcjcm
+$ ls
+dir lsprzlbf
+$ cd lsprzlbf
+$ ls
+210834 hvrpj.cdc
+29497 wcnf
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd mvzzsl
+$ ls
+dir rnrtf
+$ cd rnrtf
+$ ls
+221025 btwgwrp.ctj
+$ cd ..
+$ cd ..
+$ cd szfw
+$ ls
+dir jvcgnbs
+dir szfw
+31365 tjslbpb
+$ cd jvcgnbs
+$ ls
+250409 lwfgnzz.nvf
+66638 tchv
+dir tlms
+$ cd tlms
+$ ls
+84192 lsprzlbf.pcm
+107549 nwqzqcmw.rls
+97234 svdqvwcz
+$ cd ..
+$ cd ..
+$ cd szfw
+$ ls
+45362 zsflqrtc
+$ cd ..
+$ cd ..
+$ cd vsqjb
+$ ls
+dir vvnzdcbb
+$ cd vvnzdcbb
+$ ls
+144027 tchv
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd pprvjm
+$ ls
+dir hvst
+137237 lwfgnzz.qfp
+dir szfw
+$ cd hvst
+$ ls
+100531 svmvncf
+$ cd ..
+$ cd szfw
+$ ls
+233868 hhfqgzfj.qvt
+$ cd ..
+$ cd ..
+$ cd szfw
+$ ls
+14971 tchv
+$ cd ..
+$ cd tjslbpb
+$ ls
+283684 lwfgnzz.wzv
+$ cd ..
+$ cd ztc
+$ ls
+dir bwhfncdm
+161420 jvcgnbs
+135102 tchv
+$ cd bwhfncdm
+$ ls
+108615 lwfgnzz.msn
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd npppw
+$ ls
+94593 cwdz.tlb
+258598 jsswljc
+245674 nmmfzscz
+$ cd ..
+$ cd plmb
+$ ls
+dir dwnpl
+dir lwfgnzz
+$ cd dwnpl
+$ ls
+15993 hhfqgzfj.qvt
+264944 vmc.cdf
+$ cd ..
+$ cd lwfgnzz
+$ ls
+154801 cnbmh.hsh
+$ cd ..
+$ cd ..
+$ cd szfw
+$ ls
+173334 lsprzlbf
+dir lwfgnzz
+70693 szfw
+$ cd lwfgnzz
+$ ls
+dir jgwzcgd
+dir qgdcjq
+dir spwcmrl
+$ cd jgwzcgd
+$ ls
+dir jvcgnbs
+dir nvtvcf
+$ cd jvcgnbs
+$ ls
+131852 cntlhf.mqq
+217305 dnltsq.fwv
+174110 jvcgnbs.njb
+179602 lwfgnzz.mth
+dir pzcssdhv
+dir qcmqmnpn
+227361 szfw
+dir wmhhl
+$ cd pzcssdhv
+$ ls
+187518 gjfwbwnv
+115671 lsprzlbf
+$ cd ..
+$ cd qcmqmnpn
+$ ls
+197002 dlns
+40030 mmpp.ggt
+198158 tchv
+$ cd ..
+$ cd wmhhl
+$ ls
+168011 hhfqgzfj.qvt
+$ cd ..
+$ cd ..
+$ cd nvtvcf
+$ ls
+dir rrzjjjhc
+$ cd rrzjjjhc
+$ ls
+33548 sqs
+$ cd ..
+$ cd ..
+$ cd ..
+$ cd qgdcjq
+$ ls
+252274 prshd.qdj
+$ cd ..
+$ cd spwcmrl
+$ ls
+dir lslmr
+dir szfw
+135076 tchv
+265608 vmc.cdf
+$ cd lslmr
+$ ls
+172247 rrvwsbl
+$ cd ..
+$ cd szfw
+$ ls
+192729 rnq
diff --git a/src/bin/day07_1.rs b/src/bin/day07_1.rs
new file mode 100644
index 0000000..fe672d4
--- /dev/null
+++ b/src/bin/day07_1.rs
@@ -0,0 +1,8 @@
+use std::fs;
+
+use aoc2022::day07::process_part_1;
+
+fn main() {
+    let file = fs::read_to_string("./inputs/day7.txt").unwrap();
+    println!("{}", process_part_1(&file));
+}
diff --git a/src/bin/day07_2.rs b/src/bin/day07_2.rs
new file mode 100644
index 0000000..7dcb120
--- /dev/null
+++ b/src/bin/day07_2.rs
@@ -0,0 +1,8 @@
+use std::fs;
+
+use aoc2022::day07::process_part_2;
+
+fn main() {
+    let file = fs::read_to_string("./inputs/day7.txt").unwrap();
+    println!("{}", process_part_2(&file));
+}
diff --git a/src/day07.rs b/src/day07.rs
new file mode 100644
index 0000000..0bf541c
--- /dev/null
+++ b/src/day07.rs
@@ -0,0 +1,158 @@
+use std::collections::BTreeMap;
+
+use nom::branch::alt;
+use nom::bytes::complete::{tag, take_till1};
+use nom::character::complete::{newline, space1};
+use nom::character::{complete, is_newline};
+use nom::multi::separated_list1;
+use nom::IResult;
+
+pub fn process_part_1(input: &str) -> u32 {
+    let (_, commands) = parse_commands(input).unwrap();
+    let directories = build_directory_tree_from_commands(commands);
+
+    directories.values().filter(|size| **size <= 100_000).sum()
+}
+
+pub fn process_part_2(input: &str) -> u32 {
+    let (_, commands) = parse_commands(input).unwrap();
+    let directories = build_directory_tree_from_commands(commands);
+
+    let total_space = 70_000_000;
+    let required_space = 30_000_000;
+    let current_space = total_space - *directories.get("").unwrap();
+    let wanted_space = required_space - current_space;
+
+    directories
+        .values()
+        .filter(|size| **size >= wanted_space)
+        .map(|size| *size)
+        .min()
+        .unwrap_or(0)
+}
+
+fn build_directory_tree_from_commands(commands: Vec<Command>) -> BTreeMap<String, u32> {
+    let mut cwd: Vec<&str> = vec![];
+    let mut directories: BTreeMap<String, u32> = BTreeMap::new();
+    for command in commands {
+        match command {
+            Command::Cd("/") => {
+                cwd = vec![];
+            }
+            Command::Cd("..") => {
+                cwd.pop();
+            }
+            Command::Cd(name) => {
+                cwd.push(name);
+            }
+            Command::Ls(files) => {
+                for file in files {
+                    match file {
+                        DirEntry::File { name: _name, size } => {
+                            for i in 0..=cwd.len() {
+                                directories
+                                    .entry(cwd[..i].join("/"))
+                                    .and_modify(|f| *f += size)
+                                    .or_insert(size);
+                            }
+                        }
+                        _ => {}
+                    }
+                }
+            }
+        }
+    }
+    directories
+}
+
+#[derive(Debug)]
+enum Command<'a> {
+    Cd(&'a str),
+    Ls(Vec<DirEntry<'a>>),
+}
+
+#[derive(Debug)]
+enum DirEntry<'a> {
+    Dir(&'a str),
+    File { name: &'a str, size: u32 },
+}
+
+fn parse_commands(input: &str) -> IResult<&str, Vec<Command>> {
+    separated_list1(newline, parse_command)(input)
+}
+
+fn parse_command(input: &str) -> IResult<&str, Command> {
+    let (input, _) = tag("$ ")(input)?;
+    alt((parse_cd, parse_ls))(input)
+}
+
+fn parse_cd(input: &str) -> IResult<&str, Command> {
+    let (input, _) = tag("cd")(input)?;
+    let (input, _) = space1(input)?;
+    let (input, arg) = parse_file_name(input)?;
+    Ok((input, Command::Cd(arg)))
+}
+
+fn parse_ls(input: &str) -> IResult<&str, Command> {
+    let (input, _) = tag("ls")(input)?;
+    let (input, _) = newline(input)?;
+    let (input, entries) =
+        separated_list1(tag("\n"), alt((parse_dir_entry_dir, parse_dir_entry_file)))(input)?;
+    Ok((input, Command::Ls(entries)))
+}
+
+fn parse_dir_entry_dir(input: &str) -> IResult<&str, DirEntry> {
+    let (input, _) = tag("dir ")(input)?;
+    let (input, name) = parse_file_name(input)?;
+    Ok((input, DirEntry::Dir(name)))
+}
+
+fn parse_dir_entry_file(input: &str) -> IResult<&str, DirEntry> {
+    let (input, size) = complete::u32(input)?;
+    let (input, _) = tag(" ")(input)?;
+    let (input, name) = parse_file_name(input)?;
+    Ok((input, DirEntry::File { name, size }))
+}
+
+fn parse_file_name(input: &str) -> IResult<&str, &str> {
+    take_till1(|c| is_newline(c as u8))(input)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const INPUT: &str = "$ cd /
+$ ls
+dir a
+14848514 b.txt
+8504156 c.dat
+dir d
+$ cd a
+$ ls
+dir e
+29116 f
+2557 g
+62596 h.lst
+$ cd e
+$ ls
+584 i
+$ cd ..
+$ cd ..
+$ cd d
+$ ls
+4060174 j
+8033020 d.log
+5626152 d.ext
+7214296 k";
+
+    #[test]
+    fn day1() {
+        assert_eq!(process_part_1(INPUT), 95437);
+    }
+
+    #[test]
+    fn day2() {
+        assert_eq!(process_part_2(INPUT), 24933642);
+    }
+}
diff --git a/src/lib.rs b/src/lib.rs
index 5e44ed5..88ab862 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -7,3 +7,4 @@ pub mod day03;
 pub mod day04;
 pub mod day05;
 pub mod day06;
+pub mod day07;