using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;


class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var n = NN;
        var map = NArr(n);
        var ans = new List<int>();
        var j = 1;
        while (true)
        {
            var flg = false;
            for (var i = 0; i < n; ++i)
            {
                if (j < map[i].Length)
                {
                    ans.Add(map[i][j]);
                    flg = true;
                }
            }
            ++j;
            if (!flg) break;
        }
        WriteLine(string.Join(" ", ans));
    }
}