using System;

public class Program

{

    public static void Main()

    {

        int negativNumbersCount=0;

        Console.WriteLine("a=");

        int a = int.Parse(Console.ReadLine());

        Console.WriteLine("b=");

        int b = int.Parse(Console.ReadLine());

        Console.WriteLine("c=");

        int c = int.Parse(Console.ReadLine());

        if (a==0 || b==0 || c==0)

        {Console.WriteLine("0");}

         else 

         {if (a<0)

         {

             negativNumbersCount++;

        }

         if (b<0)

            {

             negativNumbersCount++;

            }

             if (c<0)

             {

                negativNumbersCount++;

             }            

                if (negativNumbersCount%2==0)

                {

                    Console.WriteLine("+");

                }

    else

    {

        Console.WriteLine("-");

    }

         }

    }

}