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

namespace ZeroSubset
{
    class MainClass
    {
        public static void Main(string[] args)
        {
            int[] inputNumbers = { 1, 3, -4, -2, -1 };
            int combinationsCount = (1 << inputNumbers.Length) - 1;
            for (int i = 1; i < combinationsCount; i++)
            {
                var subset = new List<int>();
                for (int j = 0; j < inputNumbers.Length; j++)
                {
                    if ((((1 << j) & i) >> j) == 1)
                    {
                        subset.Add(inputNumbers[j]);
                    }
                }
                if (subset.Sum() == 0)
                {
                    Console.WriteLine(string.Join(", ", subset));
                }
            }
        }
    }
}