1 #include <bits/stdc++.h>
 2 using namespace std;
 3 typedef long long ll;
 4 int main()
 5 {
 6     int T;
 7     cin >> T;
 8     for(int t = 1; t <= T; t++)
 9     {
10         ll n, k;
11         cin >> n >> k;
12         if(n%(k + 1) == 0)
13             cout << "B" << endl;
14         else cout << "A" << endl;
15     }
16     return 0;
17 }