#include<bits/stdc++.h>
#define int long long
using namespace std;
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (a>b) { a=b; return 1; } return 0; }

signed main()
{
    cin.tie(0);
    ios::sync_with_stdio(false);

    int N; cin>>N;
    vector<vector<int>> v(N);
    for(int i=0;i<N;i++){
        int k; cin>>k;
        while(k--){
            int a; cin>>a;
            v[i].push_back(a);
        }
        reverse(v[i].begin(),v[i].end());
    }

    vector<int> ans;
    while(true){
        bool finished=true;
        for(int i=0;i<N;i++){
            if(!v[i].empty()){
                finished=false;
                ans.push_back(v[i].back());
                v[i].pop_back();
            }
        }
        if(finished) break;
    }
    for(int a:ans) cout<<a<<' '; cout<<endl;
    return 0;
}