using System;

​

public class Program

{

    public static void Main()

    {

        int n = int.Parse(Console.ReadLine());

        int digit = 0;

        int count = 10;

​

        for (int i = 0; i <= 10; i++)

        {

            digit = n & (1 << i);

            if (digit == 0)

            {

                Console.WriteLine("A{0}", count - i);

            }

        }

    }

}