#include<bits/stdc++.h>
using namespace std;
using ll = long long int;
using ld = long double;
#define pow(n,m) powl(n,m);
#define sqrt(n) sqrtl(n);
const ll MAX = 5000000000000000000;
const ll MOD = 1000000007;
//998244353;
void randinit(){srand((unsigned)time(NULL));}
int main(){
    ll N;
    string S;
    cin >> N >> S;
    for(ll i = 1;i <= N;i++){
        if(N % i == 0){
            string T = "";
            ll q = 0;
            for(ll j = 0;j < i;j++){
                T = T + S[j];
                if(S[j] == 'Q') q++;
            }
            if(q != N / i) continue;
            bool ok = 1;
            for(ll j = 0;j < N;j++){
                if(S[j] != T[j % i]) ok = 0;
            }
            if(ok){
                cout << T << endl;
                return 0;
            }
        }
    }
    cout << -1 << endl;
}