题解 | #DNA序列#
DNA序列
https://www.nowcoder.com/practice/e8480ed7501640709354db1cc4ffd42a
s = input().strip()
n = int(input())
ans = 0
save = []
length = []
for i in range(len(s)-n+1):
temp = s[i:i+n]
save.append(temp)
n1 = temp.count('C')
n2 = temp.count('G')
length.append((n1+n2)/len(temp))
idx = length.index(max(length))
print(save[idx])
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