#include <bits/stdc++.h>
using namespace std;
#define REP(i,a) for(int i = 0; i < (a); i++)
#define ALL(a) (a).begin(),(a).end()
typedef long long ll;
typedef pair<int, int> P;
const int INF = 1e9;
const int MOD = 1e9 + 7;

signed main(){
    int n;
    cin >> n;
    int mx = 0;
    int p[n];
    vector<vector<int>> a(n);
    REP(i,n){
        cin >> p[i];
        mx = max(mx, p[i]);
        int t;
        REP(j,p[i]){
            cin >> t;
            a[i].push_back(t); 
        }
    }
    vector<int> ans;
    REP(i,mx){
        REP(j,n){
            if(i < p[j]){
                ans.push_back(a[j][i]);
            }
        }
    }
    REP(i,ans.size()){
        cout << ans[i];
        if(i != ans.size() - 1){
            cout << " ";
        }
    }
    cout << endl;
}