#include <bits/stdc++.h>
using namespace std;

void solve(){
    int n;
    cin >> n;
    string S;
    cin >> S;
    int num = 0;
    int now = 0;
    while (now < n){
        if (S[now] == '-'){
            now++;
            continue;
        }
        char sta = S[now];
        while (now < n && S[now] != '-'){
            now++;
        }
        char en = S[now-1];
        if (sta != en) continue;
        if (sta == 'P'){
            num++;
        } else{
            num--;
        }
    }
    if (num > 0){
        cout << "P" << endl;
    } else{
        cout << "K" << endl;
    }
}
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int t;
    cin >> t;
    for (int i = 0; i < t; i++){
        solve();
    }

    return 0;
}