#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
signed main() {
  ios::sync_with_stdio(false); cin.tie(0);
  int n;
  cin >> n;
  vector<vector<int>> a(n);
  for (int i = 0; i < n; i++) {
    int p;
    cin >> p;
    for (int j = 0; j < p; j++) {
      int x;
      cin >> x;
      a[i].push_back(x);
    }
  }
  vector<int> idx(n);
  vector<int> ans;
  while (true) {
    bool updated = false;
    for (int i = 0; i < n; i++) {
      if (idx[i] >= (int) a[i].size()) continue;
      ans.push_back(a[i][idx[i]]);
      idx[i]++;
      updated = true;
    }
    if (!updated) break;
  }
  for (int i = 0; i < (int) ans.size(); i++) {
    if (i > 0) cout << " ";
    cout << ans[i];
  }
  return 0;
}