#include<bits/stdc++.h>
using namespace std;
#include<atcoder/all>
using namespace atcoder;
using ll = long long;
int N;
string S;

void solve(){
	S.insert(S.begin(),'-');
	S.insert(S.end(),'-');
	N += 2;
	int cntK = 0,cntP = 0;
	for(int i = 0;i<N-1;i++){
		if(S[i]=='-'&&S[i+1]!='-'){
			if(S[i+1]=='K')cntK++;
			else cntP++;
		}
		if(S[i]!='-'&&S[i+1]=='-'){
			if(S[i]=='K')cntK++;
			else cntP++;
		}
	}
	if(cntK>=cntP) cout<<"K"<<endl;
	else cout<<"P"<<endl;
}

signed main(){
	cin.tie(nullptr);
	ios::sync_with_stdio(false);
	int T;
	cin >> T;
	while(T--){
		cin >> N >> S;
		solve();
	}
}