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

int main() {
    int N;
    string S;
    cin >> N;
    cin.ignore();
    getline(cin,S);
    if(S[N-1] == 'Q') {
        cout << S.substr(0,N-1) << 'Q' << endl;
    }
    else if(N%13 == 0) {
        for(int i = 0; i < N/13; i++) {
            cout << "H";
        }
        cout << endl;
    }
    else {
        cout << -1 << endl;
    }
}