#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0; i<(n); i++)
typedef long long ll;

int main(){
	int n; cin>>n;
	vector<vector<int>> line(n,vector<int>(100));
	rep(i,n){
		int p; cin>>p;
		rep(j,p){
			cin>>line[i][j];
		}
	}
	rep(j,100){
		rep(i,n){
			if(line[i][j]==0) continue;
			else cout<<line[i][j]<<" ";
		}
	}
	cout<<endl;
}