MultiplicationSign

using System;
    class MultiplicationSign
    {
        static void Main(string[] args)
        {
            double a = double.Parse(Console.ReadLine());
            double b = double.Parse(Console.ReadLine());
            double c = double.Parse(Console.ReadLine());

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