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

namespace _03.Spyfer
{
    class Program
    {
        static void Main(string[] args)
        {
            List<int> numbers = Console.ReadLine().Split(new char[] { ' ' }
            , StringSplitOptions.RemoveEmptyEntries).Select(int.Parse).ToList();

            for (int i = 1; i < numbers.Count - 1; i++)
            {
                int neighboringSum = numbers[i - 1] + numbers[i + 1];
                int primeNum = numbers[i];

                if (neighboringSum == primeNum)
                {
                    numbers.RemoveAt(i + 1);
                    numbers.RemoveAt(i - 1);
                    i = 0;
                }
                else if (primeNum == numbers[i - 1])
                {
                    numbers.RemoveAt(i - 1);
                    i = 0;
                }
                else if (primeNum == numbers[i + 1])
                {
                    numbers.RemoveAt(i + 1);
                    i = 0;
                }
            }

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