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;
using System.Text.RegularExpressions;
using System.Linq;
using System.Collections.Generic;
using System.IO;
using System.Numerics;

namespace ConsoleApplication1
{
    class Program
    {
        static long[] dx = new long[] { -1, 0, 1, 0 };
        static long[] dy = new long[] { 0, 1, 0, -1 };

        static void Main(string[] args)
        {
            var str = Console.ReadLine().Split();
            var a = Int32.Parse(str[0]);
            var b = Int32.Parse(str[1]);

            if (a > 0 && b > 0)
            {
                Console.WriteLine("Positive");
            }
            else if ( (a <= 0 && b >= 0) || (a >= 0 && b <= 0))
            {
                Console.WriteLine("Zero");
            }
            else
            {
                Console.WriteLine(Math.Abs(a - b) % 2 == 0 ? "Negative" : "Positive");
            }
        }
    }
}