20 lines
273 B
Python
20 lines
273 B
Python
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import re
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import sys
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def check(a):
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pattern = r'^(?!10$)10*$'
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if re.match(pattern, a):
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return True
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else:
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return False
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for line in sys.stdin:
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word = line.strip()
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if check(word):
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print("yes")
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else:
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print("no")
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