import java.util.*;
public class main
{
    public static void main(String[] args)
    {
        Scanner scan=new Scanner(System.in);
        char a=scan.next().charAt(0);
        if(pos>96)
        {
            System.out.println("Invalid input");
        }
        else
        {
            int pos=(int)a-(int)'A'+1;
            System.out.println(pos);
        }
    }
}