using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var n = long.Parse(ReadLine());
        var ans = new List<char>();
        DFS(n, ans);
        ans.Reverse();
        WriteLine(string.Concat(ans));
    }
    static bool DFS(long cur, List<char> ans)
    {
        if (cur == 1)
        {
            return true;
        }
        if ((cur - 1) % 2 == 0)
        {
            ans.Add('A');
            if (DFS((cur - 1) / 2, ans))
            {
                return true;
            }
            ans.RemoveAt(ans.Count - 1);
        }
        if ((cur - 1) % 3 == 0)
        {
            ans.Add('B');
            if (DFS((cur - 1) / 3, ans))
            {
                return true;
            }
            ans.RemoveAt(ans.Count - 1);
        }
        return false;
    }
}