#include<iostream>
#include<cassert>
using namespace std;
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	int T;cin>>T;
	for(;T--;)
	{
		int N;
		string S;
		cin>>N>>S;
		int K=0,P=0,KP=0;
		for(int i=0;i<N;i++)
		{
			if(S[i]!='-')
			{
				char f=S[i];
				while(i+1<N&&S[i+1]!='-')i++;
				char g=S[i];
				if(f!=g)KP++;
				else if(f=='K')K++;
				else P++;
			}
		}
		if(K!=P)cout<<(K>P?"K\n":"P\n");
		else cout<<"K\n";
	}
}