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

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    int N;
    cin >> N;
    vector<vector<int>> As(N, vector<int>(100, 0));
    for (auto & Ai : As){
        int p;
        cin >> p;
        for (int j = 0; j < p ; ++j) cin >> Ai[j];
    }
    vector<int> ans;
    for (int j = 0; j < 100; ++j){
        for (int i = 0; i < N; ++i){
            if (As[i][j] != 0) ans.push_back(As[i][j]);
        }
    }
    cout << ans[0];
    for (int k = 1; k < ans.size(); ++k) cout << " " << ans[k];
    return 0;
}