new_contents: # -*- coding: utf-8 -*-
  import sys
  
  if len(sys.argv) != 2:
      print(sys.argv[0] + ":argument is invalid.")
      sys.exit()
  
  text = sys.argv[1]
  
  flag = True
  while flag:
      start = text.find("【")
      end = text.find("】")
      if start == -1 or end == -1:
          flag = False
      else:
          text_list = list(text)
          del text_list[start:end + 1]
          text = "".join(text_list)
  
  print(text)
  
subject: add text_operation