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

using ll = long long;
const ll MOD = 1e9 + 7;

int main() {
    int N, x;
    cin >> N;
    vector<int> P(N);
    vector<vector<int>> A(N, vector<int>(100));
    rep(i, N) {
        cin >> P[i];
        rep(j, P[i]) {
            cin >> A[i][j];
        }
    }
    rep(i, 100) {
        rep(j, N) {
            if (i >= P[j]) continue;
            cout << A[j][i] << " ";
        }
    }
    cout << endl;
}