题解 | #DNA序列#
DNA序列
https://www.nowcoder.com/practice/e8480ed7501640709354db1cc4ffd42a
a = input()
b = int(input())
c = 0
d = []
for i in range(0, len(a) - b + 1):
if a[i : i + b].count("G") + a[i : i + b].count("C") > c:
c = a[i : i + b].count("G") + a[i : i + b].count("C")
d = a[i : i + b]
print(d)
