#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<n;i++)
using namespace std;
using ll =  long long ;
using P = pair<int,int> ;
const int INF = 1e9;
const int MOD = 1000000007;
int n = 1005;
int p = 105;
vector<vector<int>> people(n,vector<int>(p,0));

int main(){
    cin >> n;
    rep(i,n){
        int p_;
        cin >> p_;
        rep(j,p_) cin >> people[i][j];
    }
    vector<int> ans;
    rep(j,p)rep(i,n){
        if(people[i][j] == 0) continue;
        ans.push_back(people[i][j]);
    }
    
    for(int k:ans) cout << k << " ";
    cout << endl;
    return 0;
}