#include <iostream>
#include <queue>
#include <vector>
using namespace std;

int main() {
	int N, P, A, a = 0, i;
	cin >> N;
	vector<queue<int>> b(N);
	for (i = 0; i < N; ++i) {
		cin >> P;
		a += P;
		for (int j = 0; j < P; ++j) {
			cin >> A;
			b[i].push(A);
		}
	}
	while (a) {
		if (!b[i % N].empty()) {
			--a;
			cout << b[i % N].front() << ' ';
			b[i % N].pop();
		}
		++i;
	}
}