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- n, k = map(int, input().split())
- s = input()
- s = list(s)
- count = 0
- for i in range(n):
- if s[i] == "A":
- k += 1
- if s[i] == "C":
- k -= 1
- if k < 0:
- count += 1
- print(count)
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