#include <iostream>
#include <string>
using namespace std;
using ll = long long;

int N;
string S;
void solve(){
    cin >> N >> S;
    S += '-';
    int G = 0;
    for(int i = 0;i < N;i++){
        if(S[i] == '-')continue;
        string t;
        while(S[i] != '-')t += S[i], i++;
        if(t.front() != t.back())continue;
        G += (t.front() == 'K' ? 1 : -1);
    }
    cout << (G >= 0 ? "K\n" : "P\n");
}
int main(void){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int t; cin >> t;
    while(t--)solve();
    return 0;
}