#include <bits/stdc++.h>
using namespace std;
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) begin(v),end(v)
template<typename A, typename B> inline bool chmax(A & a, const B & b) { if (a < b) { a = b; return true; } return false; }
template<typename A, typename B> inline bool chmin(A & a, const B & b) { if (a > b) { a = b; return true; } return false; }
using ll = long long;
using pii = pair<int, int>;
constexpr ll INF = 1ll<<30;
constexpr ll longINF = 1ll<<60;
constexpr ll MOD = 1000000007;
constexpr bool debug = false;
//---------------------------------//

int main() {
	int N;
	cin >> N;
	vector<int> P(N);
	vector A(N, vector<int>());
	REP(i, N) {
		scanf("%d", &P[i]);
		A[i].resize(P[i]);
		for (int & in : A[i]) scanf("%d", &in);
	}
	vector<int> ans;
	REP(i, 100) REP(j, N) if (i < P[j]) ans.emplace_back(A[j][i]);
	REP(i, ans.size()) printf("%d%c", ans[i], " \n"[i + 1 == ans.size()]);
}