output_description: Output an integer representing the minimum number of iterations needed for the
  rewrite operation.
  
  * * *
input_description: Inputs are provided from Standard Input in the following form.
  
      
      
      S
attempt:         s=list(input())
          v=list("CODEFESTIVAL2016")
          cnt=0
          for i in range(16):
              if s[i]!=v[i]:
                  cnt+=1
          print(cnt)
problem_description: Statement
  
  CODE FESTIVAL 2016 is going to be held. For the occasion, Mr. Takahashi
  decided to make a signboard.
  
  He intended to write `CODEFESTIVAL2016` on it, but he mistakenly wrote a
  different string S. Fortunately, the string he wrote was the correct length.
  
  So Mr. Takahashi decided to perform an operation that replaces a certain
  character with another in the minimum number of iterations, changing the
  string to `CODEFESTIVAL2016`.
  
  Find the minimum number of iterations for the rewrite operation.
samples: [{"input": "C0DEFESTIVAL2O16", "output": "2\n    \n\nThe second character `0` must be changed to `O` and the 14th character `O`\nchanged to `0`.\n\n* * *"}, {"input": "FESTIVAL2016CODE", "output": "16"}]