import java.util.Scanner;
public class Demo3 {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int number = sc.nextInt();
int i = number%14;
if(i>8)
{
i = i-i%8;
}
switch (i) {
case 1:
System.out.println("A");
break;
case 2:
System.out.println("B");
break;
case 3:
System.out.println("C");
break;
case 4:
System.out.println("D");
break;
case 5:
System.out.println("E");
break;
case 6:
System.out.println("F");
break;
case 7:
System.out.println("G");
break;
case 8:
System.out.println("H");
break;
default:
break;
}
}
}