<image>

You can preview the image in better quality by the link: [http://assets.codeforces.com/files/656/without-text.png](//assets.codeforces.com/files/656/without-text.png)

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 C {

	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		char[] c = in.nextLine().toCharArray();
		long sum = 0l;
		for (int i = 0; i < c.length; i++) {
			if (c[i] >= 'a' && c[i] <= 'z')
				sum -= ((c[i] - 'a') + 1);
			else if (c[i] >= 'A' && c[i] <= 'Z')
				sum += ((c[i] - 'A') + 1);
		}
		System.out.println(sum);
		in.close();
	}
}