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.IO;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {

        static void Main(string[] args)
        {

            var n = "Negative";
            var p = "Positive";
            var z = "Zero";
            //Console.SetIn(new StreamReader("input.txt"));

            var ints = In.Ints().ToArray();
            var a = ints[0];
            var b = ints[1];

            if(a==0 || b == 0)
            {
                Out(z);return;
            }

            if (a < 0 && 0 < b)
            {
                Out(z); return;
            }

            if (a < 0 && b < 0)
            {
                if ((b - a) % 2 == 0)
                {
                    Out(n); return;
                }
                else
                {
                    Out(p); return;
                }
            }

            if(a > 0 && b > 0)
            {
                Out(p); return;
            }
            return;
        }

        static void Out(Object o){
            Console.WriteLine(o);
        }
    }




    class In
    {
        public static int Int()
        {
            return int.Parse(Console.ReadLine());
        }

        public static IEnumerable<int> Ints()
        {
            return Console.ReadLine().Split(' ').Select(i => int.Parse(i));
        }

        public static String Line()
        {
            return Console.ReadLine();
        }
    }
}