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

namespace AlgorithmsOverStructureData
{
    class Program
    {
        static void Main(string[] args)
        {
            List<int> numbers = Console.ReadLine().Split(" ").Select(int.Parse).ToList();
            List<int> positiveNumbers = new List<int>();
            //numbers.RemoveAll(number => number < 0);
            foreach(int number in numbers)
            {
                if(number > 0)
                {
                    positiveNumbers.Add(number);
                }
            }

            numbers.Clear();
            numbers.AddRange(positiveNumbers);


            Console.WriteLine(string.Join(", ", numbers));

        }
    }
}