Sheets

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Sheets
{
    class Program
    {
        static void Main(string[] args)
        {
            int number = int.Parse(Console.ReadLine());

            int[] array = new int[11];

            for (int i = 0; i < array.Length; i++)
            {
                array[i] = (int)Math.Pow(2, array.Length -1 - i);
                if (number < array[i])
                {
                    Console.WriteLine("A{0}", i);
                }
                else
                {
                    number -=array[i];
                }
            }
        }
    }
}