#include <iostream>
#include <algorithm>
#include <string>
#include <map>
using namespace std;
using ll = long long;
const string no = "#";

map<ll, string> memo;
string calc(ll n){
    if(n == 1)return "";
    if(memo.find(n) != memo.end())return memo[n];
    string res = no;
    if((n - 1) % 2 == 0){
        string a = calc((n - 1) / 2);
        if(a != no)res = a + "A";
    }
    if((n - 1) % 3 == 0){
        string a = calc((n - 1) / 3);
        if(a != no)res = a + "B";
    }
    return memo[n] = res;
}
ll N;
int main(void){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    cin >> N;
    string s = calc(N);
    cout << s << endl;
    return 0;
}