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: Wrong Answer)

my $str = <STDIN>;
chomp $str;
my ($N, $A, $B) = split(/\s/,$str);

$str = <STDIN>;
chomp $str;

my $i = 0, $j = 0;
my $a = 0, $b = 0;

foreach (split//, $str) {
    if ($_ ne "c" && $i + $j < $A + $B) {
        if ($_ eq "a") {
            print "Yes\n";
            $i++;
            next;
        }
        if ($_ eq "b" && $j < $B) {
            print "Yes\n";
            $j++;
            next;
        } 
    }
    print "No\n";
}