#include <bits/stdc++.h>   using namespace std;   int main() {     int x;     cin >> x;     int k = x % 4;     if (k == 1) {       cout << 0 <<   A  << endl;     } else if (k == 0) {       cout << 1 <<   A  << endl;     } else if (k == 2) {       cout << 1 <<   B  << endl;     } else {       cout << 2 <<   A  << endl;     }   }   