#include <bits/stdc++.h>
using namespace std;
void solve() {
	int N;
	cin >> N;
	string S;
	cin >> S;
	int cnt[] = {0, 0};
	string s = "-" + S + "-";
	for (int i = 0; i <= N; i ++) {
		if (s[i] == '-' && s[i + 1] != '-') {
			cnt[s[i + 1] == 'P'] ++;
		}
		if (s[i + 1] == '-' && s[i] != '-') {
			cnt[s[i] == 'P'] ++;
		}
	}
	cout << (cnt[0] >= cnt[1] ? "K" : "P") << endl;
}
int main () {
	int tt;
	cin >> tt;
	while (tt--) {
		solve();
	}
}