Sheets

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

namespace Sheets
{
    class Sheets
    {
        static void Main()
        {
            int number = int.Parse(Console.ReadLine());
            List<int> sheet = new List<int>() { 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024 };
            while (number > 0)
            {
                if (number < sheet[sheet.Count - 1])
                {
                    for (int i = 0; i < sheet.Count; i++)
                    {
                        if (sheet[i] > number)
                        {
                            number -= sheet[i - 1];
                            sheet.Remove(sheet[i - 1]);
                            break;
                        }
                        else if (sheet[i] == number)
                        {
                            number -= sheet[i];
                            sheet.Remove(sheet[i]);
                            break;
                        }
                    }
                }
                else if (number >= sheet[sheet.Count - 1])
                {
                    number -= sheet[sheet.Count - 1];
                    sheet.Remove(sheet[sheet.Count - 1]);
                }
            }
            foreach (int rest in sheet)
            {
                switch (rest)
                {
                    case 1: Console.WriteLine("A10"); break;
                    case 2: Console.WriteLine("A9"); break;
                    case 4: Console.WriteLine("A8"); break;
                    case 8: Console.WriteLine("A7"); break;
                    case 16: Console.WriteLine("A6"); break;
                    case 32: Console.WriteLine("A5"); break;
                    case 64: Console.WriteLine("A4"); break;
                    case 128: Console.WriteLine("A3"); break;
                    case 256: Console.WriteLine("A2"); break;
                    case 512: Console.WriteLine("A1"); break;
                    case 1024: Console.WriteLine("A0"); break;
                    default: break;
                }
            }
        }
    }
}