using System;

using System.Collections.Generic;

class Program

{

static void Main(string[] args)

{

List<int> list = new List<int>();

int number;

while (true)

{

String str = Console.ReadLine();

number = Int32.Parse(str);

if (number == 0) break;

if (!list.Contains(number))

list.Add(number);

}

foreach (int item in list)

{

if (item >= 0) Console.Write(item + " ");

}

foreach (int item in list)

{

if (item < 0) Console.Write(item + " ");

}

}

}