#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<long long,long long> pll;
#define ep emplace_back
#define pb push_back
#define mp make_pair
#define rep(i,n) for(int i=0;i<(n);++i)
constexpr int mod=1000000007;
constexpr int mod1=998244353;
vector<int> dx={0,1,0,-1},dy={-1,0,1,0};
bool inside(int y,int x,int h,int w){
	if(y<h && y>=0 && x<w && x>=0) return true;
	return false;
}





int main(){
	cin.tie(0);
	ios::sync_with_stdio(false);
	int n;cin >> n;
	vector<vector<int>> a(n,vector<int>(0));
	rep(i,n){
		int p;cin >> p;
		rep(j,p){
			int b;cin >> b;
			a[i].pb(b);
		}
	}
	vector<int> ans;
	vector<int> itr(n);
	while(true){
		bool ch = true;
		rep(i,n){
			if(itr.at(i) < a[i].size()){
				ans.pb(a[i][itr.at(i)]);
				itr.at(i)++;
				ch = false;
			}
		}
		if(ch) break;
	}
	rep(i,ans.size()){
		if(i == ans.size() - 1) cout << ans.at(i) << endl;
		else cout << ans.at(i) << " ";
	}
}