Exam04

using System;

namespace Ex04
{
    class Exam04
    {
        static void Main()
        {
            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) {
                if (b > 0 && c > 0) Console.WriteLine("+");
                else if (b < 0 && c < 0) Console.WriteLine("+");
                else Console.WriteLine("-");
                }
            else
            {
                if (b > 0 && c > 0) Console.WriteLine("-");
                else if (b < 0 && c < 0) Console.WriteLine("-");
                else Console.WriteLine("+");
            }
        }
    }
}