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

public class Program
{
    public void Solve()
    {
        int n = int.Parse(Console.ReadLine());
        List<S> l = new List<S>();
        for (int i = 0; i < n; i++)
        {
            int[] line = Console.ReadLine().Split(' ').Select(int.Parse).ToArray();
            int p = line[0];
            for (int j = 1; j <= p; j++)
            {
                l.Add(new S(i, j, line[j]));
            }
        }

        l.Sort((a, b) =>
        {
            if (a.J == b.J)
            {
                return a.I.CompareTo(b.I);
            }

            return a.J.CompareTo(b.J);
        });
        
        Console.WriteLine(string.Join(" ",l.Select(s=>s.Num)));
    }

    public static void Main(string[] args)
    {
        new Program().Solve();
    }
}

struct S
{
    public int I, J, Num;

    public S(int i, int j, int n)
    {
        I = i;
        J = j;
        Num = n;
    }
}