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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) {
		Scanner scanner=new Scanner(System.in);
		String s=scanner.next();
		char[] c=s.toCharArray();
		int count=0;
		for (char ch:c) {
			if (ch>='A'&&ch<='Z') {
				count+=ch-64;
			}
			if (ch>='a'&&ch<='z') {
				count-=ch-96;
			}
		}
		System.out.print(count);
	}
}