opu

str="TGCCCGAGCTATCTTATGCGCATCGCATGCGGACCCTTCCCTAGGCTTGTCGCAAGCCATTATCCTGGGCGCTAGTTGCGCGAGTATTGTCAGACCTGATGACGCTGTAAGCTAGCGTGTTCAGCGGCGCGCAATGAGCGGTTTAGATCACAGAATCCTTTGGCGTATTCCTATCCGTTACATCACCTTCCTCACCCCTA"
k=6
A=[0.364,0.333,0.303,0.212,0.121,0.242]
C=[0.182,0.182,0.212,0.303,0.182,0.303]
G=[0.121,0.303,0.182,0.273,0.333,0.303]
T=[0.333,0.182,0.303,0.212,0.364,0.152]
fans=-1.0
final=""
for i in range(len(str)):
    temp=""
    j=i
    tval=j+6
    if(tval<=len(str)):
        while(j<tval):
            temp+=str[j]
            j+=1
        #print(temp)
    tans=1
    if temp!="":

        for k in range(len(temp)):
            if(temp[k]=='A'):
                tans=tans*A[k]
            elif temp[k]=='C':
                tans=tans*C[k]
            elif temp[k]=='G':
                tans=tans*G[k]
            else:
                tans=tans*T[k]
        #print(tans)
        if tans>fans:
            final=temp
            fans=tans
            #print(final)
print(final)