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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 sc = new Scanner(System.in);
		String line = sc.nextLine();
		sc.close();
		int res = 0;
		for(int i = 0; i < line.length(); i++){
			boolean first = '@' < line.charAt(i) && '[' > line.charAt(i);
			boolean second = 96 < line.charAt(i) && '{' > line.charAt(i);
			int a = first ? 1 : 0;
			int b = second ? 1 : 0;
			String line2 = line.toLowerCase();
			int alphabetIndex = line2.charAt(i) - 'a' + 1;
			if(line.charAt(i) > 60){
					res += ( ( alphabetIndex * a) - ( alphabetIndex * b) );
			}
			else{
				res += ( ( (line.charAt(i) - 48 ) * a) - ( (line.charAt(i) - 48 ) * b) );
			}
		}
		System.out.println(res);
	}
}
