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

signed main() {
  int N;
  cin >> N;
  
  vector<vector<int>> kyaku(N, vector<int>(150, 0));
  int P;
  for( int i = 0; i < N; i++ ){
    cin >> P;
    for( int j = 0; j < P; j++ ){
      cin >> kyaku.at(i).at(j);
    }
  }
  
  for( int j = 0; j < 100; j++ ){ 
    for( int i = 0; i < N; i++ ){
      if( kyaku.at(i).at(j) != 0 ){
        cout << kyaku.at(i).at(j) << " ";
      }else{
        continue;
      }
    }
  }
  cout << " " << endl;
    
    
}