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  1. import re
  2. while 1:
  3.     str = raw_input()
  4.     if not str : break
  5.     str = re.sub(r'(^[LR](?=_)|(?<=_)[LR](?=(?:_|...$)))(.*)(?=.*\1(.))...$', r'\3\2', str+"LRL")[:len(str)]
  6.     print(str)
Success #stdin #stdout 0.01s 7856KB
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https://ideone.com/0nUNF8
language:
Python (cpython 2.7.16)
created:
11 years ago
visibility:
public

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