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++14 (GCC 5.4.1) (judge verdict: Accepted)

#define rep(i,n) for (int i=0;i<(n);i++)
#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <cmath>
using namespace std;

int main()
{
	int cnt = 0;
	string S;
	string c="CODEFESTIVAL2016";
	cin >> S;
	rep(i, 16)
		if (S[i] != c[i])
			cnt++;
	cout << cnt << endl;

}