#include <iostream>
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
ll n,a,b,MAX,V[1000];
vector<ll> v[1000];
int main(void){
    cin>>n;
    for(int i=0;i<n;i++){
        cin>>a;
        V[i]=a;
        MAX=max(MAX,a);
        for(int j=0;j<a;j++){
            cin>>b;
            v[i].push_back(b);
        }
    }
    for(int i=0;i<MAX;i++){
        for(int j=0;j<n;j++){
            if(V[j]<=i)continue;
            cout<<v[j][i]<<" ";
        }
    }
    cout<<endl;
}