// editor1
import java.util.Scanner;
public class main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String s = sc.nextLine();
        if(Character.isLowerCase(s)){
            System.out.println("Invalid input");
        }
        int r=0;
        for(char c:s.toCharArray()){
            r=r*26+(c-'A'+1);
        }
        System.out.println(r);
        
    }
}