using System;

namespace _05._Multiplication_Sign
{
    class Program
    {
        static void Main(string[] args)
        {
            double num1 = double.Parse(Console.ReadLine());
            double num2 = double.Parse(Console.ReadLine());
            double num3 = double.Parse(Console.ReadLine());
            Console.WriteLine(CheckMultiplyResult(num1, num2, num3));
        }

        private static string CheckMultiplyResult(double num1, double num2, double num3)
        {
            double[] arr = { num1, num2, num3 };
            string result;
            int negativeCounter = 0;
            bool zero = false;
            for (int i = 0; i < 3; i++)
            {
                if (arr[i] == 0)
                {
                   zero = true;
                }
                else if (arr[i] < 0)
                {
                    negativeCounter++;
                }
            }
            if (zero)
            {
                result = "zero";
            }
            else if (negativeCounter % 2 != 0)
            {
                result = "negative";
            }
            else
            {
                result = "positive";
            }
            return result;

        }
    }
}