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