Sheets

using System;
class Sheets
{
    static void Main()
    {
        int pieces = int.Parse(Console.ReadLine());

        for (int sheetSize = 0, piesePerSheet = 1024; sheetSize <= 10; sheetSize++, piesePerSheet /= 2)
        {
            if (pieces - piesePerSheet >= 0)
            {
                pieces = pieces - piesePerSheet;
            }
            else
            {
                Console.WriteLine("A{0}", sheetSize);
            }
        }
    }
}