#include <bits/stdc++.h>
using namespace std;

int main() {
  int N;
  cin >> N;
  vector<vector<int>> G(N, vector<int>(101));
  for (int i = 0, p; cin >> p; i++)
    for (int j = 0; j < p; j++) cin >> G.at(i).at(j);
  for (int i = 0; i < 101; i++)
    for (int j = 0; j < N; j++) if (G.at(j).at(i)) cout << G.at(j).at(i) << " ";
}