#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
  #define _GLIBCXX_DEBUG
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  ll n;
  cin >> n;
  string ans = "";
  function<void(ll)> dfs = [&](ll n) {
    if (n == 1) {
      reverse(ans.begin(), ans.end());
      cout << ans << endl;
      exit(0);
    }
    --n;
    if (n % 2 == 0) {
      ans += 'A';
      dfs(n / 2);
      ans.pop_back();
    }
    if (n % 3 == 0) {
      ans += 'B';
      dfs(n / 3);
      ans.pop_back();
    }
  };
  dfs(n);
  return 0;
}