import java.util.Scanner;
public class Hello{
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        String a=sc.next();
        int val=0;
        if(!(a<'Z' && a>'a')){
            System.out.println("Invalid input");
            return;
        }
        for(char ch:a.toCharArray()){
            val=val*26+(ch-'A')+1;
            
        }
        System.out.println(val);
    }
}