# 统计一段蛋白质序列中20种氨基酸出现的次数
list1 = []
seq = '''mpraprcrav rsllrshyre vlplatfvrr lgpqgwrlvq rgdpaafral vaqclvcvpw
darpppaaps frqvsclkel varvlqrlce rgaknvlafg falldgargg ppeafttsvr
sylpntvtda lrgsgawgll lrrvgddvlv hllarcalfv lvapscayqv cgpplyqlga
atqarpppha sgprrrlgce rawnhsvrea gvplglpapg arrrggsasr slplpkrprr
gaapepertp vgqgswahpg rtrgpsdrgf cvvsparpae eatslegals gtrhshpsvg
rqhhagppst srpprpwdtp cppvyaetkh flyssgdkeq lrpsfllssl rpsltgarrl
vetiflgsrp wmpgtprrlp rlpqrywqmr plflellgnh aqcpygvllk thcplraavt
paagvcarek pqgsvaapee edtdprrlvq llrqhsspwq vygfvraclr rlvppglwgs
rhnerrflrn tkkfislgkh aklslqeltw kmsvrdcawl rrspgvgcvp aaehrlreei
lakflhwlms vyvvellrsf fyvtettfqk nrlffyrksv wsklqsigir qhlkrvqlre
lseaevrqhr earpalltsr lrfipkpdgl rpivnmdyvv gartfrrekr aerltsrvka
lfsvlnyera rrpgllgasv lglddihraw rtfvlrvraq dpppelyfvk vdvtgaydti
pqdrltevia siikpqntyc vrryavvqka ahghvrkafk shvstltdlq pymrqfvahl
qetsplrdav vieqssslne assglfdvfl rfmchhavri rgksyvqcqg ipqgsilstl
lcslcygdme nklfagirrd glllrlvddf llvtphltha ktflrtlvrg vpeygcvvnl
rktvvnfpve dealggtafv qmpahglfpw cgllldtrtl evqsdyssya rtsirasltf
nrgfkagrnm rrklfgvlrl kchslfldlq vnslqtvctn iykilllqay rfhacvlqlp
fhqqvwknpt fflrvisdta slcysilkak nagmslgakg aagplpseav qwlchqafll
kltrhrvtyv pllgslrtaq tqlsrklpgt tltaleaaan palpsdfkti ld'''
for i in 'acdefghiklmnpqrstvwy':
num = seq.count(i)
print(i,num)
list1.append(num)
print(max(list1))