using System;
using System.Collections.Generic;
using System.Text;

class ZeroSubset
{
     public static int sumToFind = 0;
     public static Stack<int> stack = new Stack<int>();
     public static int tempSum = 0;
     public static int[] inputNumbers = { 1, 3, -4, -2, -1 };

     public static void RecursiveCalc(int[] data, int startIndex, int endIndex)
     {
          for (int currentIndex = startIndex; currentIndex < endIndex; currentIndex++)
          {
                stack.Push(data[currentIndex]);
                tempSum += data[currentIndex];
                RecursiveCalc(data, currentIndex + 1, endIndex);
                tempSum -= (int) stack.Pop();
          }
          if (tempSum == sumToFind)
          {
                printSet(stack);
          }
    }//end of RecursiveCalc()

    public static void printSet(Stack<int> stack)
    {
         StringBuilder sb = new StringBuilder();
         sb.Append(sumToFind).Append(" = ");
         foreach (int value in stack)
         {
              sb.Append(value).Append("+");
         }
         sb.Length--;
         if (sb.Length < 4) return;
         Console.WriteLine(sb.ToString());
     }// end of printSet()

     static void Main()
     {
         RecursiveCalc(inputNumbers, 0, inputNumbers.Length);
     }//end of Main()
}// end of class