#include<bits/stdc++.h>
using namespace std;
using ll=long long;
#define rep(i,n) for(int i=0;i<n;i++)
#define rrep(i,n) for(int i=(n)-1;i>=0;i--)
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
template<class T> bool chmax(T &a, T b){if (a < b){a = b;return true;} else return false;}
template<class T> bool chmin(T &a, T b){if (a > b){a = b;return true;} else return false;}

int main(){
    ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    int T;
    cin>>T;
    while(T--){
        int N;
        cin>>N;
        string S;
        cin>>S;
        int l=0;
        int ck=0,cp=0;
        while(l<N){
            if(S[l]!='-'){
                int r=l;
                bool is_k=(S[r]=='K');
                int cnt=0;
                while(r<N&&S[r]!='-'){
                    if(r+1<N&&S[r+1]!='-'&&S[r+1]!=S[r]){
                        cnt++;
                    }
                    r++;
                }
                if(cnt%2==1){
                    ck+=(cnt+1)/2;
                    cp+=(cnt+1)/2;
                }else{
                    if(is_k){
                        ck+=cnt/2+1;
                        cp+=cnt/2;
                    }else{
                        ck+=cnt/2;
                        cp+=cnt/2+1;
                    }
                }
                l=r;
            }else{
                l++;
            }
        }
        if(ck>=cp)cout<<"K\n";
        else cout<<"P\n";
    }
}