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- file = open('21.txt')
- s = file.readline()
- l = 1
- kro = 0
- koo = 0
- krr = 0
- ans = 0
- for r in range(2, len(s)):
- if s[r-1:r+1] == 'RO':
- kro += 1
- if s[r-2:r+1] == 'ORO':
- koo += 1
- if s[r-2:r+1] == 'ROR':
- krr += 1
- while kro >= 21 and krr == 0 and koo == 0:
- if s[l-1:l+1] == 'RO':
- kro -= 1
- l += 1
- ans = max(ans, r - l + 1)
- if krr != 0 or koo != 0:
- l = r
- krr = 0
- koo = 0
- print(ans)
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