Multiplication Sign

using System;

namespace MultiplicationSign
{
    class MultiplicationSign
    {
        static void Main()
        {
            double a = double.Parse(Console.ReadLine());
            double b = double.Parse(Console.ReadLine());
            double c = double.Parse(Console.ReadLine());

            if (a < 0)
            {
                if (b < 0)
                {
                    if (c < 0)
                    {
                        Console.WriteLine("-");
                    }
                    else
                    {
                        Console.WriteLine("+");
                    }
                }
                else
                {
                    if (c < 0)
                    {
                        Console.WriteLine("-");
                    }
                    else
                    {
                        Console.WriteLine("+");
                    }
                }
            }
            else if (a > 0)
            {
                if (b < 0)
                {
                    if (c < 0)
                    {
                        Console.WriteLine("+");
                    }
                    else
                    {
                        Console.WriteLine("-");
                    }
                }
                else
                {
                    if (c < 0)
                    {
                        Console.WriteLine("-");
                    }
                    else
                    {
                        Console.WriteLine("+");
                    }
                }
            }
            else if ((a == 0) || (b == 0) || (c == 0))
            {
                Console.WriteLine("0");
            }
        }
    }
}