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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 Main {
    static String str;
    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    static BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

    public static void main(String[] args) throws IOException {
        str = br.readLine();
        char ch;
        int cnt = 0;
        for (int i = 0; i < str.length(); ++i) {
            ch = str.charAt(i);
            if (ch >= 'A' && ch <= 'Z') {
                cnt += ch - 'A' + 1;
            } else if (ch >= 'a' && ch <= 'z') {
                cnt -= ch - 'a' + 1;
            }
        }
        bw.write(cnt + "");
        bw.close();
    }
}