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Input

The only line of the input is a string (between 1 and 50 characters long, inclusive). Each character will be an alphanumeric character or a full stop ".".

Output

Output the required answer.

Examples

Input

Codeforces


Output

-87


Input

APRIL.1st


Output

17
import java.util.*;
import java.io.*;
import java.lang.*;


public class C656 {

  public static void main(String[] args) {
    
    Scanner s = new Scanner(System.in);
    String word = s.next();

    int res = 0;
    for(int i=0; i< word.length(); i++){
      int b1, b0;
      b1 = 0;
      b0 = 0;
      if('A' <= word.toUpperCase().charAt(i) && 'Z' >= word.toUpperCase().charAt(i)){
      if(word.charAt(i) > '@' && word.charAt(i) < '[')
          res -= 'A'-1 - (int) word.toUpperCase().charAt(i);
      if(word.charAt(i) > '`' && word.charAt(i) < '{')
          res += 'A'-1 - (int) word.toUpperCase().charAt(i);
      }
    }
    System.out.println(res);
  }
}



