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- stroka = str(input())
- stroka = stroka.replace(' ', '')
- ans = 0
- for i in range(len(stroka)):
- if stroka[i] == '1':
- tmpstr = stroka[0:i]
- if '2' in tmpstr:
- a = i - tmpstr.rfind('2')
- else:
- a = 11
- tmpstr = stroka[i:]
- if '2' in tmpstr:
- b = tmpstr.find('2')
- else:
- b = 11
- x = min(a, b)
- if x > ans:
- ans = x
- print(ans)
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