#include <bits/stdc++.h>

using namespace std;
void fast_io() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
}

int main() {
    fast_io();
    int t;
    cin >> t;
    for (; t--;) {
        int n;
        string s;
        cin >> n >> s;
        char mi = '.', ma = '.';
        for (char c : s) {
            if (c == '-') {
                continue;
            }
            if (mi == '.') {
                mi = c;
            }
            ma = c;
        }
        if (mi == ma) {
            cout << mi << "\n";
            continue;
        }
        vector<int> cnt;
        for (char c : s) {
            if (c == '-') {
                if (!cnt.empty() && cnt.back() > 0) {
                    cnt.push_back(0);
                }
                continue;
            } else {
                if (cnt.empty()) {
                    cnt.push_back(1);
                } else {
                    cnt.back()++;
                }
            }
        }
        if (cnt.size() == 1) {
            cout << "K\n";
            continue;
        }
        cnt.front()--;
        cnt.back()--;
        int grundy = 0;
        for (int x : cnt) {
            grundy ^= x;
        }
        cout << (grundy ? "P\n" : "K\n");
    }
}