#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 1000000000000000001


int main(){

/*
	for(int i=1;i<=20;i++){
		cout<<i<<' '<<check(i,0)<<endl;
	}*/
	int _t;
	cin>>_t;
	rep(_,_t){
		int n;
		cin>>n;
		string s;
		cin>>s;
		
		vector<string> t;
		rep(i,n){
			if(s[i]=='-')t.push_back("");
			else{
				if(t.size()==0 || t.back()=="")t.push_back(string(1,s[i]));
				else t.back() += s[i];
			}
		}
		int X = 0,Y = 0;
		rep(i,t.size()){
			if(t[i].size()==0 || t[i][0]!=t[i].back())continue;
			if(t[i][0]=='P')X++;
			else Y++;
		}
		while(true){
			X--;
			if(X<0){
				cout<<"K"<<endl;
				break;
			}
			Y--;
			if(Y<0){
				cout<<"P"<<endl;
				break;
			}
		}
	}
	
	return 0;
}