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 PHP (5.6.30) (judge verdict: Accepted)

<?php
/*
    http://agc005.contest.atcoder.jp/tasks/agc005_b

    Score  :
    Result :
    Time   : ms
    Memory : KB
 */

fscanf(STDIN, "%s", $S);
$arrS = str_split($S);
$A = "CODEFESTIVAL2016";
$arrA = str_split($A);
$ans = 0;

for ($i = 0; $i < count($arrS); $i++) {
	if ($arrS[$i] != $arrA[$i]) $ans++;
}
echo $ans . PHP_EOL;