#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  int t;
  cin >> t;
  while (t--) {
    int n, j, temp, cnt = 0;
    cin >> n;
    string s;
    cin >> s;
    for (int i = 0; i < n; i++) {
      temp = 0;
      for (int j = 0; j < n - 1; j++) {
        if (s[j] == 'A' && s[j + 1] == 'P') {
          s[j + 1] = 'A';
          j++;
          temp = 1;
        }
      }
      if (temp == 1) {
        cnt++;
      } else
        break;
    }
    cout << cnt << endl;
  }
  return 0;
}
