#include <bits/stdc++.h>

using namespace std;

int main(){
    
    int n;
    cin >> n;
    int sum = 0;
    vector<deque<int>> a(n);
    for(int i = 0; i < n; ++i){
        int p;
        cin >> p;
        sum += p;
        for(int j = 0; j < p; ++j){
            int x; scanf("%d", &x);
            a[i].emplace_back(x);    
        }
    }
    int i = 0;
    vector<int> res;
    while(sum){
        if(!a[i].empty()){
            res.emplace_back(a[i].front()); a[i].pop_front();
            --sum;
        }
        ++i;
        if(i >= n) i = 0;
    }
    
    for(int x : res){
        cout << x << " ";
    }
    cout << endl;
    
    return 0;
}