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

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	int n;
	cin >> n;
	vector<int> p(n);
	vector<vector<int>> a(n, vector<int>(100));
	int b = 0;
	rep(i, n) {
		cin >> p[i];
		b += p[i];
		rep(j, p[i]) {
			cin >> a[i][j];
		}
	}
	vector<int> ans(0);
	int x = 0;
	int res = 0;
	while (1) {
		rep(i, n) {
			if (a[i][x] != 0) {
				ans.push_back(a[i][x]);
				res++;
			}
		}
		if (res == b) break;
		x += 1;
	}
	rep(i, b) {
		cout << ans[i] << ' ';
	}
	cout << endl;
}