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: Wrong Answer)

using System;

namespace RangeProduct {
    class Program {
        static void Main(string[] args) {
            int a, b;
            string[] str = Console.ReadLine().Split(' ');
            a = int.Parse(str[0]);
            b = int.Parse(str[1]);
            if ((a >= 0 && b<= 0)||(a<=0&&b>=0)) {
                Console.WriteLine("0");
            }
            else if (a > 0 && b > 0) {
                Console.WriteLine("Positive");
            }
            else {
                if (a % 2 ==0) {
                    if (b % 2 == 0) {
                        Console.WriteLine("Negative");
                    }else {
                        Console.WriteLine("Positive");
                    }
                }else {
                    if (b % 2 == 0) {
                        Console.WriteLine("Positive");
                    }
                    else {
                        Console.WriteLine("Negative");
                    }
                }
            }
        }
    }
}