#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int INF = 1e9 + 10;
const ll INFL = 4e18;

int main() {
    ll N;
    cin >> N;

    map<ll, bool> mp;
    string ans;

    auto F = [&](auto&& F, ll n) -> bool {
        if (n == 1) {
            return true;
        }
        if (mp.count(n)) {
            return mp[n];
        }

        if ((n - 1) % 2 == 0 && F(F, (n - 1) / 2)) {
            ans.push_back('A');
            return mp[n] = true;
        }
        if ((n - 1) % 3 == 0 && F(F, (n - 1) / 3)) {
            ans.push_back('B');
            return mp[n] = true;
        }
        return mp[n] = false;
    };

    F(F, N);
    cout << ans << endl;
}