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

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

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