include
using namespace std;
int main() {
int n;
cin >> n;
int a[n];
int b[1001];
for (int i = 0; i < 1001; i++) {
b[i] = 0;
}
for (int i = 0; i < n; i++) {
int t;
cin >> t;
b[t]++;
}
int m;
cin >> m;
int f = 0;
for (int i = 0; i < 1001; i++) {
if (b[i] >= m) {
cout << i << " ";
f = 1;
}
}
if (f == 0) {
cout << "-1";
}
return 0;
}
