#include <bits/stdc++.h>
using namespace std;

#define REP(i, n) for(int (i) = 0; (i) < (n); (i)++)
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#define MIN(a, b) ((a) < (b) ? (a) : (b))

typedef long long ll;

int main(void){
	int n;
	cin >> n;

	vector< vector<int> > v(n, vector<int>(100));
	vector<int> p(n);
	REP(i, n){
		cin >> p[i];
		REP(j, p[i]){
			cin >> v[i][j];
		}
	}

	vector<int> line;
	int flg = 1, cnt = 0;
	while(flg){
		flg = 0;
		REP(i, n){
			if(p[i] > cnt){
				line.push_back(v[i][cnt]);
				flg = 1;
			}
		}
		cnt++;
	}

	REP(i, line.size()){
		cout << line[i] << ' ';
	}
	cout << endl;

	return 0;
}