#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define rep(i, n) for(int i=0;i<(n);++i)
#define rep1(i, n) for(int i=1;i<=(n);i++)
#define ll long long
using mint = modint998244353;
using P = pair<ll,ll>;
using lb = long double;
using T = tuple<ll, ll, ll>;
#ifdef LOCAL
#  include <debug_print.hpp>
#  define dbg(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#  define dbg(...) (static_cast<void>(0))
#endif

int main()
{
    ll n;
    cin >> n;
    map<ll, ll> memo;
    auto f = [&](auto f, ll now) -> ll {
        ll res = 1e18;
        if(memo.count(now)) return memo[now];
        if(now==1) return 0;
        if((now-1)%2==0) {
            res = min(res, f(f, (now-1)/2)+1);
        }
        if((now-1)%3==0) {
            res = min(res, f(f, (now-1)/3)+1);
        }
        return memo[now] = res;
    };
    ll now = n;
    string ans;
    f(f, n);
    while(now!=1) {
        if((now-1)%2==0 && memo[(now-1)/2]==memo[now]-1) {
            now = (now-1)/2;
            ans += 'A';
        }
        else{
            now = (now-1)/3;
            ans += 'B';
        }
    }
    reverse(ans.begin(),ans.end());
    cout << ans << endl;
    return 0;
}