#include <bits/stdc++.h>

using namespace std;

void fast_io() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
}

map<long long, bool> memo;
map<long long, string> op;
bool dp(long long n) {
    if (memo.find(n) != memo.end()) return memo[n];
    if (n == 1) {
        memo[n] = true;
        op[n] = "";
        return true;
    }
    if ((n - 1) % 2 == 0 && dp((n - 1) / 2)) {
        memo[n] = true;
        op[n] = op[(n - 1) / 2] + "A";
        return true;
    }
    if ((n - 1) % 3 == 0 && dp((n - 1) / 3)) {
        memo[n] = true;
        op[n] = op[(n - 1) / 3] + "B";
        return true;
    }
    return false;
}
int main() {
    fast_io();
    long long n;
    cin >> n;
    assert(dp(n));
    cout << op[n] << endl;
}