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 Python (2.7.6) (judge verdict: Runtime Error)

args = list(map(lambda x: int(x), raw_input().split()))
N = args[0]
A = args[1]
B = args[2]
s = input()

a = 0
b = 0
for i in range(0, len(s)):
    if s[i] == 'a':
        if a + b < A + B:
            a = a + 1
            print('Yes')
        else:
            print('No')
    elif s[i] == 'b':
        if a + b < A + B and b < B:
            b = b + 1
            print('Yes')
        else:
            print('No')
    else:
        print('No')