#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < n; i++)
#define all(A) (A).begin(),(A).end()
using namespace std;
using ll = long long;

void solve(vector<string>& S,string ans,int n){
    if(n == 1) return;
    n--;
    if(n%2 == 0 && n/2 >= 1){
        ans.push_back('A');
        solve(S,ans,n/2);
        if(n/2 == 1) S.push_back(ans);
        ans.pop_back();
    }
    if(n%3 == 0 && n/3 >= 1){
        ans.push_back('B');
        solve(S,ans,n/3);
        if(n/3 == 1) S.push_back(ans);
        ans.pop_back();
    }
    return;
}

int main(){
    ll n; cin >> n;
    string ans = "";
    vector<string> S;
    solve(S,ans,n);
    if(S.size() >= 1) reverse(all(S[0]));
    if(S.size() >= 1) cout << S[0];
}