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

int main() {
    ll n;
    std::cin >> n;
    vector<vector<ll>> p(n);
    ll sum = 0;
    for (int i = 0; i < n; i++) {
        ll k;
        std::cin >> k;
        sum += k;
        for (int j = 0; j < k; j++) {
            ll tmp;
            std::cin >> tmp;
            p[i].push_back(tmp);
        }
    }
    ll now = 0;
    while(sum>0){
        if(p[now].size()>0){
            std::cout << p[now][0]<<" ";
            p[now].erase(p[now].begin());
            sum--;
        }
        now++;
        now%=n;
    }
    std::cout << std::endl;
}