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- file = open('20.txt')
- s = file.readline()
- l = 1
- k = 0
- ans = 0
- for r in range(1, len(s)):
- if s[r-1:r+1] == 'AB':
- k += 1
- while k >= 50:
- if s[l-1:l+1] == 'AB':
- k -= 1
- l += 1
- ans = max(ans, r - l + 1)
- print(ans)
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