new_contents: #!/usr/bin/python
  # -*- coding: utf-8 -*-
  '''
  Created on March 10, 2014
  
  @author: Chunwei Yan @ PKU
  @mail:  yanchunwei@outlook.com
  '''
  import re
  import sys
  
  while True:
      sentence = sys.stdin.readline().strip()
      if not sentence:
          break
  
      sentence = re.sub("(('')|[_].|\(.*\))|([.]$)", "", sentence)
  
      sys.stdout.write(sentence+"\n")
  
subject: add data cleaner