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.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace AGC002_A
{
    class Program
    {
        static void Main(string[] args)
        {
           
            var a = scan();
            if ( a[0] <0 &&  0<a[1] ||a[0]==0||a[1]==0)
            {
                Console.WriteLine("Zero");
            }
            else
            {
                if (a[0]>0)
                {
                    Console.WriteLine("Positive");
                }
                else
                {
                    if ((a[1]-a[0])%2==0)
                    {
                        Console.WriteLine("Negative");
                    }
                    else
                    {
                        Console.WriteLine("Positive");
                    }
                }
            }
        }
        static int[] scan()
        {
            return
                Console.ReadLine().Split(' ').Select(i => int.Parse(i)).ToArray();
        }
    }
}