using System;
using System.Text;

public class Program
{
    static sbyte NumSing(int num)
    {
        sbyte result = 0;

        if (num < 0)
        {
            result = -1;
        }
        else if (num > 0)
        {
            result = 1;
        }

        return result;
    }// sbyte NumSing(int num)

    public static void Main()
    {
        int num1 = int.Parse(Console.ReadLine());
        int num2 = int.Parse(Console.ReadLine());
        int num3 = int.Parse(Console.ReadLine());
        string s = string.Empty;

        bool isZero = ((NumSing(num1) == 0) || (NumSing(num2) == 0) || (NumSing(num3) == 0));

        if  (isZero)
        {
            s = "zero";
        }
        else
        {
            num1 = NumSing(num1) + NumSing(num2) + NumSing(num3);

            if ((num1 == -3) || (num1 == 1))
            {
                s = "negative";
            }
            if ((num1 == 3) || (num1 == -1))
            {
                s = "positive";
            }
        }

        Console.WriteLine(s);
    }
}