#include <bits/stdc++.h>
using namespace std;

int main() {
    int t;
    cin >> t;

    while (t--) {
        int n;
        cin >> n;
        string arr;
        cin >> arr;

        string ans = "";
        int points = (n / 2) + 1; 
        int d = n - points;       

        for (int i = 0; i < n; i++) {
            if (d != 0) {
                ans.push_back('P');
                if (arr[i] != 'R') {
                    d -= 1;
                }
            } else {
                if (arr[i] == 'R') {
                    ans.push_back('P');
                } else if (arr[i] == 'S') {
                    ans.push_back('R');
                } else {
                    ans.push_back('S');
                }
            }
        }

        cout << ans << endl;
    }

    return 0;
}