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(){
	 int a,b,n;
	 scanf("%d %d %d",&n,&a,&b);
	 char s[n+1];
	 scanf("%s",s);
	 int passer = 0;
	 int passer_foreigner = 1;
	 
	 int i=0;
	 for(i=0;i<n;i++){
		 if(passer >= a+b){
			 printf("No\n");
		 }else{
			 if(s[i]=='a'){
				 printf("Yes\n");
				 passer++;
			 }else if(s[i] == 'b'){
				 if(passer_foreigner <= b){
					 printf("Yes\n");
					 passer_foreigner++;
					 passer++;
				 }else{
					 printf("No\n");
				 }
			 }else{
				 printf("No\n");
			 }
		 }
	 }
	 
	 return 0;
 }