#include <bits/stdc++.h>
using namespace std;
#define int long long
#define FOR(i, s, n) for (int i = (s); i < (int)(n); i++)
#define RFOR(i, s, n) for (int i = (n) - 1; i >= (int)(s); i--)
#define REP(i, n) FOR(i, 0, n)
#define RREP(i, n) RFOR(i, 0, n)
#define ALL(a) a.begin(), a.end()
constexpr long long INF = 1e18;
template<class T>inline bool CHMAX(T&a,T b){if(a<b){a=b;return true;}return false;}
template<class T>inline bool CHMIN(T&a,T b){if(a>b){a=b;return true;}return false;}



signed main(){
	int N;
	cin >> N;
	vector<int>v[N];
	REP(i,N){
		int t;
		cin >> t;
		REP(j,t){
			int tt;
			cin >> tt;
			v[i].push_back(tt);
		}
		reverse(ALL(v[i]));
	}
	vector<int>ans;
	int flg = 1;
	while(flg){
		flg = 0;
		REP(i,N){
			if(v[i].size() == 0)continue;
			else{
				flg = 1;
				ans.push_back(v[i].back());
				v[i].pop_back();
			}
		}
	}
	REP(i,ans.size()){
		if(i)cout<<" ";
		cout<<ans[i];
	}
	cout << endl;
}