#include<iostream>
#include<string>
#include<iomanip>
#include<cmath>
#include<vector>
#include<algorithm>

using namespace std;

#define int long long
#define endl "\n"

const long long INF = (long long)1e18;
const long long MOD = 1'000'000'007; 

string yn(bool f){return f?"Yes":"No";}
string YN(bool f){return f?"YES":"NO";}



signed main(){
	cin.tie(0);
	ios::sync_with_stdio(false);
	cout<<fixed<<setprecision(10);
	
	int N;
	vector<int> ans;
	vector<vector<int>> A;
	
	cin>>N;
	
	A.resize(N);
	
	for(int i = 0; i < N; i++){
		int p;
		
		cin>>p;
		
		A[i].resize(p);
		
		for(int j = 0; j < p; j++){
			int a;
			cin>>a;
			A[i][p-j-1] = a;
		}
	}
	
	for(int i = 0;;){
		bool flag = false;
		
		for(int j = 0; j < N; j++){
			if(A[j].size()){
				flag = true;
				// ans += A[j][A.size()-1];
				ans.push_back(A[j].back());
				A[j].pop_back();
			}
		}
		
		if(!flag) break;
	}
	
	
	for(int i = 0; i < ans.size(); i++){
		if(i) cout<<" ";
		cout<<ans[i];
	}
	cout<<endl;
	return 0;
}