#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define rep(i, n) for(int i=0;i<(n);++i)
#define rep1(i, n) for(int i=1;i<=(n);i++)
#define ll long long
using mint = modint998244353;
using P = pair<ll,ll>;
using lb = long double;
using T = tuple<ll, ll, ll>;
#ifdef LOCAL
#  include <debug_print.hpp>
#  define dbg(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#  define dbg(...) (static_cast<void>(0))
#endif

int main()
{
    int t;
    cin >> t;
    while(t--) {
        int n;
        string s;
        cin >> n >> s;
        int k = 0;
        int p = 0;
        for(int i=0;i<n;i++) {
            if(s[i]=='-') continue;
            int j = i;
            if(s[i]=='K') k++;
            else p++;
            while(j<n && s[j]==s[i]) {
                j++;
            }
            i = j-1;
        }
        if(k>=p) cout << "K" << endl;
        else cout << "P" << endl;
    }
    return 0;
}