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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.io.*;

public class CF656C {
	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		char[] cc = br.readLine().toCharArray();
		int n = cc.length;
		int sum = 0;
		for (int i = 0; i < n; i++) {
			char c = cc[i];
			if (c >= 'A' && c <= 'Z')
				sum += c - 'A' + 1;
			else if (c >= 'a' && c <= 'z')
				sum -= c - 'a' + 1;
		}
		System.out.println(sum);
	}
}
