import java.util.*;
class main
{
    public static void main(String args[])
    {
        Scanner sc=new Scanner(System.in);
        String s=sc.nextLine();
       if(Character.isUpperCase(s)==true)
       {
        switch(s)
        {
            case "A":
                System.out.print("1");
                break;
            case "B":
                System.out.print("2");break;
            case "C":
                System.out.print("3");break;
            case "D":
                System.out.print("4");break;
            case "E":
                System.out.print("5");break;
            case "F":
                System.out.print("6");break;
            case "G":
                System.out.print("7");break;
            case "H":
                System.out.print("8");break;
            case "I":
                System.out.print("9");break;
            case "J":
                System.out.print("10");break;
            case "K":
                System.out.print("11");break;
            case "L":
                System.out.print("12");break;
            case "M":
                System.out.print("13");break;
            case "N":
                System.out.print("14");break;
            case "O":
                System.out.print("15");break;
            case "P":
                System.out.print("16");break;
            case "Q":
                System.out.print("17");break;
            case "R":
                System.out.print("18");break;
            case "S":
                System.out.print("19");break;
            case "T":
                System.out.print("20");break;
            case "U":
                System.out.print("21");break;
            case "V":
                System.out.print("22");break;
            case "W":
                System.out.print("23");break;
            case "X":
                System.out.print("24");break;
            case "Y":
                System.out.print("25");break;
            case "Z":
                System.out.print("26");break;
        }
       
        }
         else
        {
            System.out.print("Invalid input");
        }
    }
}