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

int main() {
  int N;
  cin >> N;

  vector<vector<int>> A(N);
  for (int i = 0; i < N; ++i) {
    int P;
    cin >> P;
    A[i].resize(P);
    for (int j = 0; j < P; ++j) {
      cin >> A[i][j];
    }
  }

  vector<int> ans;
  for (int j = 0; j < 100; ++j) {
    for (int i = 0; i < N; ++i) {
      if (A[i].size() > j) {
        ans.push_back(A[i][j]);
      }
    }
  }

  for (int i = 0; i < ans.size(); ++i) {
    cout << ans[i] << " \n"[i + 1 == ans.size()];
  }

  return 0;
}