Aliens

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

namespace Marsiane
{
    enum Color {White, Grey, Black}

    class Program
    {
        static int[][] Input()
        {
            var n = int.Parse(Console.ReadLine());
            var martians = Enumerable.Range(0,n)
                .Select(x => Console.ReadLine().Split()
                    .Select(y => int.Parse(y) - 1)
                    .Where(y => y > -1)
                    .ToArray())
                .ToArray();
            return martians;
        }

        static void Search(int[][] martians, Color[] colors, int v, Stack<int> stack)
        {
            colors[v] = Color.Grey;
            foreach (var w in martians[v])
            {
                if (colors[w] == Color.White)
                {
                    Search(martians, colors, w, stack);
                }
            }
            colors[v] = Color.Black;
            stack.Push(v);
        }

        static void Main(string[] args)
        {
            var martians = Input();
            var stack = new Stack<int>();
            var colors = new Color[martians.Length];
            for (int i = 0; i < martians.Length; i++)
            {
                if (colors[i] == Color.White)
                {
                    Search(martians, colors, i, stack);
                }
            }
            foreach(var e in stack)
                Console.Write("{0} ", e + 1);
        }
    }
}