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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 WithoutText {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		String s = scan.nextLine();
		int res = 0;
		for(int i = 0 ; i < s.length() ; i++)
			res+=Character.isAlphabetic(s.charAt(i))?Character.isLowerCase(s.charAt(i))?-1*(s.charAt(i)-'a'+1):s.charAt(i)-'A'+1:0;
		System.out.println(res);
	}
}
