#include<bits/stdc++.h>
#define rep(i,n) for(int i=0;i<n;i++)
using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef vector<long long> vl;
typedef vector<vector<int>> vvi;
typedef vector<vector<long long>> vvl;
typedef pair<int,int> P;
typedef long double ld;

template<typename T>istream& operator>>(istream& is, vector<T>& v){int n = v.size(); assert(n > 0); rep(i, n) is >> v[i]; return is;}
template<typename U, typename T> ostream& operator<<(ostream& os, const pair<U, T>& p){os << p.first << ' ' << p.second; return os;}
template<typename T>ostream& operator<<(ostream& os, const vector<T>& v){int n = v.size(); rep(i, n) os << v[i] << (i == n - 1 ? "\n" : " "); return os;}
template <typename T>ostream& operator<<(ostream& os, const vector<vector<T>>& v){int n = v.size(); rep(i, n) os << v[i] << (i == n - 1 ? "\n" : ""); return os;}

template<typename T> void chmin(T& a, T b){a = min(a, b);}
template<typename T> void chmax(T& a, T b){a = max(a, b);}

int solve(){
	int n;
	cin >> n;
	int k = 0, p = 0;
	string s;
	{
		string _s;
		cin >> _s;
		s += '-';
		s += _s;
		s += '-';
		n += 2;
	}
	char first = '?';
	char last = '?';
	rep(i, n){
		if(s[i] == '-'){
			if(first == '?') continue;
			else{
				if(first == 'P' and last == 'P') p++;
				if(first == 'K' and last == 'K') k++;
				first = '?';
				last = '?';
			}
		}else{
			if(first == '?') first = s[i];
			last = s[i];
		}
	}
	if(k >= p) cout << "K\n";
	else cout << "P\n";
	return 0;
}

int main(){
	int t;
	cin >> t;
	rep(_, t) solve();
	return 0;
}