Problem:
Problem Statement

You are given two integers a and b (a≤b). Determine if the product of the integers a, a+1, …, b is positive, negative or zero.

Constraints

a and b are integers.

-10^9≤a≤b≤10^9

Partial Score

In test cases worth 100 points, -10≤a≤b≤10.

Input

The input is given from Standard Input in the following format:

a b

Output

If the product is positive, print Positive. If it is negative, print Negative. If it is zero, print Zero.

Sample Input 1

1 3

Sample Output 1

Positive

1×2×3=6 is positive.

Sample Input 2

-3 -1

Sample Output 2

Negative

(-3)×(-2)×(-1)=-6 is negative.

Sample Input 3

-1 1

Sample Output 3

Zero

(-1)×0×1=0.

Solution in C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;

namespace A___Range_Product
{
    class Program
    {
        static void Main (string[] args)
        {
            var input = Console.ReadLine ().Split (' ');
            var a = int.Parse (input[0]);
            var b = int.Parse (input[1]);
            if (a >= 1 && b >= 1)
                Console.WriteLine ("Positive");

            else if (a < 0 && b < 0 && (Math.Abs (a - b) + 1) % 2 == 1)
                Console.WriteLine ("Negative");

            else if (a < 0 && b < 0 && (Math.Abs (a - b) + 1) % 2 == 0)
                Console.WriteLine ("Positive");

            else if (a <= 0 && b >= 0)
                Console.WriteLine ("Zero");
        }
    }
}