{"raw_statement":[{"iden":"problem statement","content":"CODE FESTIVAL 2016 is going to be held. For the occasion, Mr. Takahashi decided to make a signboard.\nHe intended to write `CODEFESTIVAL2016` on it, but he mistakenly wrote a different string $S$. Fortunately, the string he wrote was the correct length.\nSo 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`.\nFind the minimum number of iterations for the rewrite operation."},{"iden":"constraints","content":"*   $S$ is $16$ characters long.\n*   $S$ consists of uppercase and lowercase alphabet letters and numerals."},{"iden":"input","content":"Inputs are provided from Standard Input in the following form.\n\n$S$"},{"iden":"sample input 1","content":"C0DEFESTIVAL2O16"},{"iden":"sample output 1","content":"2\n\nThe second character `0` must be changed to `O` and the $14$th character `O` changed to `0`."},{"iden":"sample input 2","content":"FESTIVAL2016CODE"},{"iden":"sample output 2","content":"16"}],"translated_statement":null,"sample_group":[],"show_order":["default"],"formal_statement":null,"simple_statement":null,"has_page_source":true}