#include<bits/stdc++.h>
using namespace std;
#define inf INT_MAX
#define INF LLONG_MAX
#define ll long long
#define ull unsigned long long
#define M (int)(1e9+7)
#define P pair<int,int>
#define PLL pair<ll,ll>
#define FOR(i,m,n) for(int i=(int)m;i<(int)n;i++)
#define RFOR(i,m,n) for(int i=(int)m;i>=(int)n;i--)
#define rep(i,n) FOR(i,0,n)
#define rrep(i,n) RFOR(i,n,0)
#define all(a) a.begin(),a.end()
#define IN(a,n) rep(i,n){ cin>>a[i]; }
const int vx[4] = {0,1,0,-1};
const int vy[4] = {1,0,-1,0};
#define PI 3.14159265
#define F first
#define S second
#define PB push_back
#define EB emplace_back
#define int ll
#define vi vector<int>
#define IP pair<int,P>
#define PP pair<P,P>
#define Yes(f){cout<<(f?"Yes":"No")<<endl;}
#define YES(f){cout<<(f?"YES":"NO")<<endl;}


signed main(){
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout<<fixed<<setprecision(20);

  int n;
  cin>>n;
  vector<vi> v;
  rep(i,n){
    int p;
    cin>>p;
    vi a;
    rep(j,p){
      int b;
      cin>>b;
      a.PB(b);
    }
    reverse(all(a));
    v.PB(a);
  }

  vi ans;
  bool flag=true;
  while(flag){
    flag=false;
    rep(i,n){
      if(v[i].size()){
        flag=true;
        ans.PB(*v[i].rbegin());
        v[i].erase(v[i].begin()+v[i].size()-1);
      }
    }
  }

  rep(i,ans.size()){
    cout<<ans[i]<<' ';
  }
  cout<<endl;


}