// Program 21: Alphabetic Potential of a String

import java.util.*;
class StringPotential {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.nextLine();
        int sum = 0;
        for (int i = 0; i < s.length(); i++) {
            char ch = s.charAt(i);
            if (ch == '.' || ch == '?') {
                break;
            }
            ch = Character.toUpperCase(ch);
            if (ch >= 'A' && ch <= 'Z') {
                sum += ch - 'A' + 1;
            }
        }
        System.out.println("Potential = " + sum);
    }
}