//#define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
#define rep(i, n) for(int i=0; i<n; ++i)
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(), v.rend()
using namespace std;
using ll = int64_t;
using ld = long double;
using P = pair<int, int>;
using vs = vector<string>;
using vi = vector<int>;
using vvi = vector<vi>;
template<class T> using PQ = priority_queue<T>;
template<class T> using PQG = priority_queue<T, vector<T>, greater<T> >;
const int INF = 0xccccccc;
const ll LINF = 0xcccccccccccccccLL;
template<typename T1, typename T2>
inline bool chmax(T1 &a, T2 b) {return a < b && (a = b, true);}
template<typename T1, typename T2>
inline bool chmin(T1 &a, T2 b) {return a > b && (a = b, true);}
template<typename T1, typename T2>
istream &operator>>(istream &is, pair<T1, T2> &p) { return is >> p.first >> p.second;}
template<typename T1, typename T2>
ostream &operator<<(ostream &os, const pair<T1, T2> &p) { return os << p.first << ' ' << p.second;}



//head

array<int, 301> grundy;
array<vi, 301> mm;

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	grundy[1] = 0;
	mm[3].emplace_back(0);
	for(int i = 2; i < 101; i++) {
		if(~i&1) mm[i].emplace_back(0);
		sort(all(mm[i]));
		mm[i].erase(unique(all(mm[i])), mm[i].end());
		mm[i].emplace_back(INF);
		rep(j, mm[i].size()-1) if(mm[i][j] != mm[i][j+1]-1) {
			grundy[i] = mm[i][j]+1;
			break;
		}
		mm[i*2-1].emplace_back(grundy[i]^grundy[i-1]);
		mm[i*3].emplace_back(grundy[i]);
		mm[i*3-1].emplace_back(grundy[i-1]);
		mm[i*3-2].emplace_back(grundy[i]);
	}
	int n;
	cin >> n;
	if(grundy[n]) cout << "A\n";
	else cout << "B\n";
}