제출 #72657

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런타임 에러 (RTE)
stderr:
 Traceback (most recent call last):
  File "Main.py", line 14, in <module>
    b.popleft()
AttributeError: 'list' object has no attribute 'popleft'

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런타임 에러 (RTE)
stderr:
 Traceback (most recent call last):
  File "Main.py", line 14, in <module>
    b.popleft()
AttributeError: 'list' object has no attribute 'popleft'

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런타임 에러 (RTE)
stderr:
 Traceback (most recent call last):
  File "Main.py", line 14, in <module>
    b.popleft()
AttributeError: 'list' object has no attribute 'popleft'

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