using System.Linq;
using System.Collections.Generic;
using System;

public class Hello
{
    static void Main()
    {
        var n = int.Parse(Console.ReadLine().Trim());
        var q = new Queue<int>[n];
        var tc = 0;
        for (int i = 0; i < n; i++)
        {
            q[i] = new Queue<int>();
            string[] line = Console.ReadLine().Trim().Split(' ');
            var m = int.Parse(line[0]);
            tc += m;
            for (int j = 0; j < m; j++)
                q[i].Enqueue(int.Parse(line[j + 1]));
        }
        getAns(n, q, tc);
    }
    static void getAns(int n, Queue<int>[] q, int tc)
    {
        var ans = new int[tc];
        var ansp = 0;
        var p = 0;
        while (true)
        {
            if (q[p].Count() > 0)
            {
                ans[ansp++] = q[p].Dequeue();
                if (ansp == tc) break;
            }
            p++;
            if (p == n) p = 0;
        }
        Console.WriteLine(string.Join(" ", ans));
    }
}