#include "bits/stdc++.h"

using namespace std;

void solve()
{
    int n;
    cin >> n;
    vector<queue<int>> r;
    int res = 0;
    for (int i = 0; i < n; i++)
    {
        int p;
        cin >> p;
        res += p;
        queue<int> q;
        while (p--)
        {
            int x;
            cin >> x;
            q.push(x);
        }
        r.push_back(q);
    }

    for (int cnt = 0; res; cnt++)
    {
        int i = cnt % n;
        if (r[i].empty())
        {
            continue;
        }
        res--;
        cout << r[i].front() << ' ';
        r[i].pop();
    }
    cout << endl;
}

int main()
{
    solve();
    return 0;
}