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- file = open('17.txt')
- s = file.readline()
- f = [0] * len(s)
- for i in range(2, len(s)):
- if (s[i] == 'A' and s[i-2] == 'A') or (s[i] == 'C' and s[i-2] == 'C'):
- f[i] = f[i-2] + 2
- print(max(f))
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