#include <bits/stdc++.h>
using namespace std;

int main() {
    long long n;
    cin >> n;
    string ans = "";
    auto f = [&](auto f, long long x) -> bool {
        if (x == 1) {
            return true;
        }
        if ((x - 1) % 2 == 0 && f(f, (x - 1) / 2) == true) {
            ans += "A";
            return true;
        }
        if ((x - 1) % 3 == 0 && f(f, (x - 1) / 3) == true) {
            ans += "B";
            return true;
        }
        return false;
    };
    f(f, n);
    cout << ans << endl;
}