Problem:
Score : 100 points

Problem 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.

Constraints

S is 16 characters long.

S consists of uppercase and lowercase alphabet letters and numerals.

Input

Inputs are provided from Standard Input in the following form.

S

Output

Output an integer representing the minimum number of iterations needed for the rewrite operation.

Sample Input 1

C0DEFESTIVAL2O16

Sample Output 1

2

The second character 0 must be changed to O and the 14th character O changed to 0.

Sample Input 2

FESTIVAL2016CODE

Sample Output 2

16

Solution in C (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <stdio.h>

int main(void)
{
	int n,a,b,c,d,e,i ;
	char s[100000] ;
	
	scanf("%d %d %d",&n, &a, &b);
	scanf("%s", &s);
	
	c=0;
	e=0;
	d = a + b ;
	
	for(i=0 ; i<n  ; i++){
		
		if(s[i]=='a'){
			if(c < d){
				printf("Yes\n") ;
				c++ ;
			}else{
				printf("No\n") ;
			}
			
		}else if(s[i]=='b'){
			e++ ;
			if(c < d && e <= b){
				printf("Yes\n") ;
				c++ ;
			}else{
				printf("No\n") ;
			}	
		}else{
			printf("No\n") ;
		}
	}

	return 0 ;
}