include <bits/stdc++.h>

using namespace std;

int main() {

int a[100001] = {0}, n, m, l;
cin >> n;
int s = 0;
for (int k = 1; k <= n; k++) {
	cin >> l;
	a[l]++;
}
cin >> m;
for (int k = 0; k <= 100000; k++) {
	while (a[k] >= m) {

		cout << k<<" ";
		a[k] = 0;
		s = 1;
	}
}
if (s == 0) {
	cout << "-1";
}

return 0;

}