output_description: Print `Yes` if the string `CF` can be obtained from the string s by deleting
  some characters. Otherwise print `No`.
  
  * * *
input_description: The input is given from Standard Input in the following format:
  
      
      
      s
attempt: import re
  print("YNEOS"[1-re.match('.*C.*F',input())::2]
  
problem_description: Statement
  
  This contest is `CODEFESTIVAL`, which can be shortened to the string `CF` by
  deleting some characters.
  
  Mr. Takahashi, full of curiosity, wondered if he could obtain `CF` from other
  strings in the same way.
  
  You are given a string s consisting of uppercase English letters. Determine
  whether the string `CF` can be obtained from the string s by deleting some
  characters.
samples: [{"input": "CODEFESTIVAL", "output": "Yes\n    \n\n`CF` is obtained by deleting characters other than the first character `C` and\nthe fifth character `F`.\n\n* * *"}, {"input": "FESTIVALCODE", "output": "No\n    \n\n`FC` can be obtained but `CF` cannot be obtained because you cannot change the\norder of the characters.\n\n* * *"}, {"input": "CF", "output": "Yes\n    \n\nIt is also possible not to delete any characters.\n\n* * *"}, {"input": "FCF", "output": "Yes\n    \n\n`CF` is obtained by deleting the first character."}]