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 Scala (2.11.7) (judge verdict: Accepted)


import scala.io.StdIn

object Main {
  def main(args: Array[String]): Unit = {
    val N = StdIn.readLine()
    val ans = "CODEFESTIVAL2016"
    var counter = 0
    for ((ch, i) <- N.toCharArray.zipWithIndex) {
      if (ch != ans.charAt(i)) {
        counter += 1
      }
    }
    println(counter)
  }

}