#include <iostream>
#include <vector>

using namespace std;

int main() {
	int n;
	cin >> n;
	vector<int> v(n);
	for (int i = 0; i < n; i++) {
		cin >> v[i];
	}

	bool repeat = false;
	for (int i = 0; i < n; i++) {
		if (i != v[i] && v[v[i]] == v[i]) {
			repeat = true;
		}
	}
	cout << (repeat ? "repeated" : "unique") << endl;
	return 0;
}