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

signed main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout << fixed << setprecision(20);
 
    int n;
    cin>>n;
    vector<vector<int>> v(n);
    for(int i=0;i<n;i++){
        int p;
        cin>>p;
        for(int j=0;j<p;j++){
            int a;
            cin>>a;
            v[i].push_back(a);
        }
    }
    int now[n]={};
    while(true){
        bool end = true;
        for(int i=0;i<n;i++){
            if(now[i]<v[i].size()){
                cout << v[i][now[i]] << " ";
                now[i]++;
                end = false;
            }
        }
        if(end) break;
    }
    cout << endl;


}