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;

class Program {
    static int ReadInt() { return int.Parse(Console.ReadLine()); }
    static int[] ReadInts() { return Console.ReadLine().Split().Select(int.Parse).ToArray(); }
    static string[] ReadStrings() { return Console.ReadLine().Split(); }

    static int Calc(int a, int b) {
        if (a > 0) return 1;
        if (a == 0 || b == 0) return 0;
        if (a < 0 && b > 0) return 0;

        int n = Math.Min(-1, b) - a + 1;
        if (n % 2 == 0) return 1;
        return -1;
    }

    static void Main() {
        var ab = ReadInts();
        int a = ab[0], b = ab[1];

        int ans = Calc(a, b);
        if (ans > 0) Console.WriteLine("Positive");
        else if (ans == 0) Console.WriteLine("Zero");
        else Console.WriteLine("Negative");
    }
}