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


int main()
{
  ll n;
  cin>>n;
  map<int,vector<ll>> mp;
  for(ll i=0;i<n;++i){
    ll tmp;
    cin>>tmp;
    for(ll j=0;j<tmp;++j){
      ll num;
      cin>>num;
      mp[i].push_back(num);
    }
  }
  
  bool is_space=false;
  for(ll i=0;i<200;++i){
    for(ll j=0;j<n;++j){
      if(mp[j].at(i)){
        if(is_space)cout<<" ";
        is_space=true;
        cout<<mp[j].at(i);
      }
    }
  }
  cout<<endl;
}