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 Perl (v5.18.2) (judge verdict: Accepted)

# Here your code !
my $txt = <STDIN>;
chomp $txt;
my @txts = split(//,$txt);

my $ans = 'CODEFESTIVAL2016';
my @anss = split(//,$ans);

my $i = 0;
my $count = 0;
foreach my $c (@txts) {
    if ($c ne $anss[$i]) {
        $count++;
    }
    $i++;
}

print $count, "\n";