#include <bits/stdc++.h>
//#include <atcoder/modint>
using namespace std;
//using namespace atcoder;
//using mint = modint998244353;
#define rep(i,n) for(long long i=0;i<n;i++)
#define rep1(i,n) for(long long i=1;i<=n;i++)
#define Rep(i,a,b) for(long long i=a;i<=b;i++)
#define all(a) (a).begin(), (a).end()
#define fst first
#define snd second
typedef unsigned long long ull;
typedef long long ll;
typedef vector<int> vec;
typedef vector<vector<int>> vvec;
typedef vector<long long> vecll;
typedef vector<vector<long long>> vvecll;

//#include<boost/multiprecision/cpp_int.hpp>
//using namespace boost::multiprecision;

const ll mod=998244353;
//const ll mod=1e9+7;
const ll INF=5e18;
const int INT_INF=1e9;
const double pi=3.14159265358979;

//xのn乗をpで割ったあまりを求める
ll modpow(ll x,ll n,ll p=mod){
  if(n==0) return 1;
  if(n%2==1) return (x*modpow(x,n-1,p))%p;
  else{
    ll t=modpow(x,n/2,p);
    assert(t>0);
    return (t*t)%p;
  }
}

//xの逆元(p:素数)
ll inv(ll x,ll p=mod){
  return modpow(x,p-2,p);
}

template <typename T>
int index(vector<T> &a, T x){
	return lower_bound(all(a),x)-a.begin();
}


int main(){
	int t;
  cin >> t;
  rep(_,t){
    int n;
    string s;
    cin >> n >> s;
    int k=0,p=0,kp=0;
    char a,b;
    rep(i,n){
      if(s[i]=='-') continue;
      if(i==0 || s[i-1]=='-'){
        a=s[i];
      }
      if(i==n-1 || s[i+1]=='-'){
        b=s[i];
        if(a!=b) kp++;
        else if(a=='K') k++;
        else p++;
      }
    }
    k+=kp%2;
    //cout << k << " " << p << " " << kp <<endl;
    cout << (k>=p?'K':'P') << endl;
  }
    return 0;
}