Standard input is empty

a b c d aa ab ac ad ba bb bc bd ca cb cc cd da db dc dd aaa aab aac aad aba abb abc abd aca acb acc acd ada adb adc add baa bab bac bad bba bbb bbc bbd bca bcb bcc bcd bda bdb bdc bdd caa cab cac cad cba cbb cbc cbd cca ccb ccc ccd cda cdb cdc cdd daa dab dac dad dba dbb dbc dbd dca dcb dcc dcd dda ddb ddc ddd aaaa aaab aaac aaad aaba aabb aabc aabd aaca aacb aacc aacd aada aadb aadc aadd abaa abab abac abad abba abbb abbc abbd abca abcb abcc abcd abda abdb abdc abdd acaa acab acac acad acba acbb acbc acbd acca accb accc accd acda acdb acdc acdd adaa adab adac adad adba adbb adbc adbd adca adcb adcc adcd adda addb addc addd baaa baab baac baad baba babb babc babd baca bacb bacc bacd bada badb badc badd bbaa bbab bbac bbad bbba bbbb bbbc bbbd bbca bbcb bbcc bbcd bbda bbdb bbdc bbdd bcaa bcab bcac bcad bcba bcbb bcbc bcbd bcca bccb bccc bccd bcda bcdb bcdc bcdd bdaa bdab bdac bdad bdba bdbb bdbc bdbd bdca bdcb bdcc bdcd bdda bddb bddc bddd caaa caab caac caad caba cabb cabc cabd caca cacb cacc cacd cada cadb cadc cadd cbaa cbab cbac cbad cbba cbbb cbbc cbbd cbca cbcb cbcc cbcd cbda cbdb cbdc cbdd ccaa ccab ccac ccad ccba ccbb ccbc ccbd ccca cccb cccc cccd ccda ccdb ccdc ccdd cdaa cdab cdac cdad cdba cdbb cdbc cdbd cdca cdcb cdcc cdcd cdda cddb cddc cddd daaa daab daac daad daba dabb dabc dabd daca dacb dacc dacd dada dadb dadc dadd dbaa dbab dbac dbad dbba dbbb dbbc dbbd dbca dbcb dbcc dbcd dbda dbdb dbdc dbdd dcaa dcab dcac dcad dcba dcbb dcbc dcbd dcca dccb dccc dccd dcda dcdb dcdc dcdd ddaa ddab ddac ddad ddba ddbb ddbc ddbd ddca ddcb ddcc ddcd ddda dddb dddc dddd aaaaa aaaab aaaac aaaad aaaba aaabb aaabc aaabd aaaca aaacb aaacc aaacd aaada aaadb aaadc aaadd aabaa aabab aabac aabad aabba aabbb aabbc aabbd aabca aabcb aabcc aabcd aabda aabdb aabdc aabdd aacaa aacab aacac aacad aacba aacbb aacbc aacbd aacca aaccb aaccc aaccd aacda aacdb aacdc aacdd aadaa aadab aadac aadad aadba aadbb aadbc aadbd aadca aadcb aadcc aadcd aadda aaddb aaddc aaddd abaaa abaab abaac abaad ababa ababb ababc ababd abaca abacb abacc abacd abada abadb abadc abadd abbaa abbab abbac abbad abbba abbbb abbbc abbbd abbca abbcb abbcc abbcd abbda abbdb abbdc abbdd abcaa abcab abcac abcad abcba abcbb abcbc abcbd abcca abccb abccc abccd abcda abcdb abcdc abcdd abdaa abdab abdac abdad abdba abdbb abdbc abdbd abdca abdcb abdcc abdcd abdda abddb abddc abddd acaaa acaab acaac acaad acaba acabb acabc acabd acaca acacb acacc acacd acada acadb acadc acadd acbaa acbab acbac acbad acbba acbbb acbbc acbbd acbca acbcb acbcc acbcd acbda acbdb acbdc acbdd accaa accab accac accad accba accbb accbc accbd accca acccb acccc acccd accda accdb accdc accdd acdaa acdab acdac acdad acdba acdbb acdbc acdbd acdca acdcb acdcc acdcd acdda acddb acddc acddd adaaa adaab adaac adaad adaba adabb adabc adabd adaca adacb adacc adacd adada adadb adadc adadd adbaa adbab adbac adbad adbba adbbb adbbc adbbd adbca adbcb adbcc adbcd adbda adbdb adbdc adbdd adcaa adcab adcac adcad adcba adcbb adcbc adcbd adcca adccb adccc adccd adcda adcdb adcdc adcdd addaa addab addac addad addba addbb addbc addbd addca addcb addcc addcd addda adddb adddc adddd baaaa baaab baaac baaad baaba baabb baabc baabd baaca baacb baacc baacd baada baadb baadc baadd babaa babab babac babad babba babbb babbc babbd babca babcb babcc babcd babda babdb babdc babdd bacaa bacab bacac bacad bacba bacbb bacbc bacbd bacca baccb baccc baccd bacda bacdb bacdc bacdd badaa badab badac badad badba badbb badbc badbd badca badcb badcc badcd badda baddb baddc baddd bbaaa bbaab bbaac bbaad bbaba bbabb bbabc bbabd bbaca bbacb bbacc bbacd bbada bbadb bbadc bbadd bbbaa bbbab bbbac bbbad bbbba bbbbb bbbbc bbbbd bbbca bbbcb bbbcc bbbcd bbbda bbbdb bbbdc bbbdd bbcaa bbcab bbcac bbcad bbcba bbcbb bbcbc bbcbd bbcca bbccb bbccc bbccd bbcda bbcdb bbcdc bbcdd bbdaa bbdab bbdac bbdad bbdba bbdbb bbdbc bbdbd bbdca bbdcb bbdcc bbdcd bbdda bbddb bbddc bbddd bcaaa bcaab bcaac bcaad bcaba bcabb bcabc bcabd bcaca bcacb bcacc bcacd bcada bcadb bcadc bcadd bcbaa bcbab bcbac bcbad bcbba bcbbb bcbbc bcbbd bcbca bcbcb bcbcc bcbcd bcbda bcbdb bcbdc bcbdd bccaa bccab bccac bccad bccba bccbb bccbc bccbd bccca bcccb bcccc bcccd bccda bccdb bccdc bccdd bcdaa bcdab bcdac bcdad bcdba bcdbb bcdbc bcdbd bcdca bcdcb bcdcc bcdcd bcdda bcddb bcddc bcddd bdaaa bdaab bdaac bdaad bdaba bdabb bdabc bdabd bdaca bdacb bdacc bdacd bdada bdadb bdadc bdadd bdbaa bdbab bdbac bdbad bdbba bdbbb bdbbc bdbbd bdbca bdbcb bdbcc bdbcd bdbda bdbdb bdbdc bdbdd bdcaa bdcab bdcac bdcad bdcba bdcbb bdcbc bdcbd bdcca bdccb bdccc bdccd bdcda bdcdb bdcdc bdcdd bddaa bddab bddac bddad bddba bddbb bddbc bddbd bddca bddcb bddcc bddcd bddda bdddb bdddc bdddd caaaa caaab caaac caaad caaba caabb caabc caabd caaca caacb caacc caacd caada caadb caadc caadd cabaa cabab cabac cabad cabba cabbb cabbc cabbd cabca cabcb cabcc cabcd cabda cabdb cabdc cabdd cacaa cacab cacac cacad cacba cacbb cacbc cacbd cacca caccb caccc caccd cacda cacdb cacdc cacdd cadaa cadab cadac cadad cadba cadbb cadbc cadbd cadca cadcb cadcc cadcd cadda caddb caddc caddd cbaaa cbaab cbaac cbaad cbaba cbabb cbabc cbabd cbaca cbacb cbacc cbacd cbada cbadb cbadc cbadd cbbaa cbbab cbbac cbbad cbbba cbbbb cbbbc cbbbd cbbca cbbcb cbbcc cbbcd cbbda cbbdb cbbdc cbbdd cbcaa cbcab cbcac cbcad cbcba cbcbb cbcbc cbcbd cbcca cbccb cbccc cbccd cbcda cbcdb cbcdc cbcdd cbdaa cbdab cbdac cbdad cbdba cbdbb cbdbc cbdbd cbdca cbdcb cbdcc cbdcd cbdda cbddb cbddc cbddd ccaaa ccaab ccaac ccaad ccaba ccabb ccabc ccabd ccaca ccacb ccacc ccacd ccada ccadb ccadc ccadd ccbaa ccbab ccbac ccbad ccbba ccbbb ccbbc ccbbd ccbca ccbcb ccbcc ccbcd ccbda ccbdb ccbdc ccbdd cccaa cccab cccac cccad cccba cccbb cccbc cccbd cccca ccccb ccccc ccccd cccda cccdb cccdc cccdd ccdaa ccdab ccdac ccdad ccdba ccdbb ccdbc ccdbd ccdca ccdcb ccdcc ccdcd ccdda ccddb ccddc ccddd cdaaa cdaab cdaac cdaad cdaba cdabb cdabc cdabd cdaca cdacb cdacc cdacd cdada cdadb cdadc cdadd cdbaa cdbab cdbac cdbad cdbba cdbbb cdbbc cdbbd cdbca cdbcb cdbcc cdbcd cdbda cdbdb cdbdc cdbdd cdcaa cdcab cdcac cdcad cdcba cdcbb cdcbc cdcbd cdcca cdccb cdccc cdccd cdcda cdcdb cdcdc cdcdd cddaa cddab cddac cddad cddba cddbb cddbc cddbd cddca cddcb cddcc cddcd cddda cdddb cdddc cdddd daaaa daaab daaac daaad daaba daabb daabc daabd daaca daacb daacc daacd daada daadb daadc daadd dabaa dabab dabac dabad dabba dabbb dabbc dabbd dabca dabcb dabcc dabcd dabda dabdb dabdc dabdd dacaa dacab dacac dacad dacba dacbb dacbc dacbd dacca daccb daccc daccd dacda dacdb dacdc dacdd dadaa dadab dadac dadad dadba dadbb dadbc dadbd dadca dadcb dadcc dadcd dadda daddb daddc daddd dbaaa dbaab dbaac dbaad dbaba dbabb dbabc dbabd dbaca dbacb dbacc dbacd dbada dbadb dbadc dbadd dbbaa dbbab dbbac dbbad dbbba dbbbb dbbbc dbbbd dbbca dbbcb dbbcc dbbcd dbbda dbbdb dbbdc dbbdd dbcaa dbcab dbcac dbcad dbcba dbcbb dbcbc dbcbd dbcca dbccb dbccc dbccd dbcda dbcdb dbcdc dbcdd dbdaa dbdab dbdac dbdad dbdba dbdbb dbdbc dbdbd dbdca dbdcb dbdcc dbdcd dbdda dbddb dbddc dbddd dcaaa dcaab dcaac dcaad dcaba dcabb dcabc dcabd dcaca dcacb dcacc dcacd dcada dcadb dcadc dcadd dcbaa dcbab dcbac dcbad dcbba dcbbb dcbbc dcbbd dcbca dcbcb dcbcc dcbcd dcbda dcbdb dcbdc dcbdd dccaa dccab dccac dccad dccba dccbb dccbc dccbd dccca dcccb dcccc dcccd dccda dccdb dccdc dccdd dcdaa dcdab dcdac dcdad dcdba dcdbb dcdbc dcdbd dcdca dcdcb dcdcc dcdcd dcdda dcddb dcddc dcddd ddaaa ddaab ddaac ddaad ddaba ddabb ddabc ddabd ddaca ddacb ddacc ddacd ddada ddadb ddadc ddadd ddbaa ddbab ddbac ddbad ddbba ddbbb ddbbc ddbbd ddbca ddbcb ddbcc ddbcd ddbda ddbdb ddbdc ddbdd ddcaa ddcab ddcac ddcad ddcba ddcbb ddcbc ddcbd ddcca ddccb ddccc ddccd ddcda ddcdb ddcdc ddcdd dddaa dddab dddac dddad dddba dddbb dddbc dddbd dddca dddcb dddcc dddcd dddda ddddb ddddc ddddd