#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (n); ++i)

using namespace std;
using ll = long long;

int main() {
    ll n;
    cin >> n;
    
    string ans;
    auto f = [&](auto& f, ll n, string t) -> void {
        if (n < 1) return;
        if (n == 1) {
            ans = t;
            return;
        }
        n--;
        if (n%3 == 0) f(f, n/3, t+'B');   
        if (n%2 == 0) f(f, n/2, t+'A');
    };
    f(f, n, "");
    reverse(ans.begin(), ans.end());
    
    cout << ans << '\n';
    
    return 0;
}