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

int main(){
    int n;
    cin >> n;
    queue<int> que[1010];

    queue<int> num;

    for(int i = 0;i < n;i++){
        int p;
        cin >> p;
        for(int j = 0;j < p;j++){
            int a;
            cin >> a;
            que[i].push(a);
        }
        num.push(i);
    }

    queue<int> ans;

    while(!num.empty()){
        int idx = num.front();
        num.pop();
        if(que[idx].size() == 0) continue;

        ans.push(que[idx].front());
        que[idx].pop();
        num.push(idx);
    }

    while(!ans.empty()){
        cout << ans.front();
        ans.pop();
        if(ans.empty()){
            cout << endl;
        }else{
            cout << " ";
        }
    }

    return 0;
}