#include <bits/stdc++.h>
using namespace std;
vector<long long int> read(long long int n) {
  vector<long long int> a;
  for (long long int i = 0; i < n; i++) {
    long long int x;
    cin >> x;
    a.push_back(x);
  }
  return a;
}
template <typename T>
void showArr(T a) {
  for (auto i : a) cout << i << " ";
  cout << endl;
}
int main() {
  long long int n;
  cin >> n;
  vector<long long int> a = read(2 * n);
  sort(a.begin(), a.end());
  reverse(a.begin(), a.end());
  long long int sum = 0;
  for (auto x : a) {
    sum += x;
  }
  long long int sumx = 0;
  for (long long int i = 0; i < a.size() / 2; i++) {
    sumx += a[i];
  }
  if (sum - sumx == sumx) {
    cout << -1 << endl;
  } else {
    showArr(a);
  }
  return 0;
}
