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

int main() {
  int n;
  cin >> n;
  int a, p;
  vector<int> vec[1005];
  for (int i = 0; i < n; i++) {
    cin >> p;
    for (int j = 0; j < p; j++) {
      cin >> a;
      vec[i].push_back(a);
    }
    reverse(vec[i].begin(), vec[i].end());
  }
  vector<int> ans;
  bool flag = true;
  while (flag) {
    flag = false;
    for (int i = 1; i <= n; i++) {
      if (vec[i].size() == 0) continue;
      flag = true;
      ans.push_back(vec[i].back());
      vec[i].pop_back();
    }
  }
  for (int i = 0; i < ans.size(); i++) {
    cout << ans[i] << " ";
  }
  cout << endl;
  return 0;
}