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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.Scanner;

public class Main {

    public static void main(String[] args) {
	// write your code here
        Scanner in = new Scanner(System.in);
        String t = in.next();
        int res = 0;
        for (char c: t.toCharArray()) {
            if (c >= 'A' && c <= 'Z')
                res = res + (c - 'A' + 1);
            if (c >= 'a' && c <= 'z')
                res = res - (c - 'a' + 1);
        }
        System.out.println(res);
    }
}
				 			 		 	 	             	