#include <bits/stdc++.h>
using namespace std;
using Int = long long;
constexpr static int mod = 1e9 + 7;
constexpr static int inf = (1 << 30) - 1;
constexpr static Int infll = (1LL << 61) - 1;
int Competitive_Programming = (ios_base::sync_with_stdio(false), cin.tie(nullptr), cout << fixed << setprecision(15), 0);
#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")

#include <vector>
#include <algorithm>
template <typename T>
vector<T> divisor(T n)
{
	vector<T> divisor;
	for (T i = 1; i * i <= n; i++)
	{
		if (n % i == 0)
		{
			divisor.push_back(i);
			if (i * i != n)
				divisor.push_back(n / i);
		}
	}
	sort(divisor.begin(), divisor.end());
	return divisor;
}

int main()
{
	int N, cnt = 0;
	cin >> N;
	string s;
	cin >> s;

	for (int i = 0; i < N; i++)
	{
		if (s[i] == 'Q')
			cnt++;
		if (s[i] == 'H')
		{
			cout << -1 << "\n";
			return 0;
		}
	}

	if (cnt == 0)
	{
		cout << -1 << "\n";
		return 0;
	}
	else
	{
		auto divs = divisor(N);
		for (auto &d : divs)
		{
			int len = N / d;
			string code = s.substr(0, len), ret = "";

			for (char op : code)
			{
				if (op == 'Q')
					ret += code;
			}

			if (s == ret)
			{
				cout << code;
				return 0;
			}
		}

		cout << -1 << "\n";
	}
}