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.Linq;
    using System.Collections.Generic;
    using System.Text.RegularExpressions;
    using System.Text;
     
    public class Program
    {
        public void Proc() {
            Reader.IsDebug = false;
            long[] inpt = Reader.ReadLine().Split(' ').Select(a=>long.Parse(a)).ToArray();
            NegaPosi ans = NegaPosi.Zero;

            if(inpt[0]>0&&inpt[1]>0) {
                ans = NegaPosi.Positive;
            } else if(inpt[0]<0&&inpt[1]<0) {
                if((inpt[1]-inpt[0]+1)%2==0) {
                    ans = NegaPosi.Positive;
                } else {
                    ans = NegaPosi.Negative;
                }
            }

            // a，a+1，…，b すべての積が、正ならば Positive を、負ならば Negative を、0 ならば Zero を出力せよ。
            string tmp = (ans==NegaPosi.Positive)?"Positive":(ans==NegaPosi.Negative?"Negative":"Zero");
            Console.WriteLine(tmp);

        }

        private enum NegaPosi {
            Negative,
            Positive,
            Zero
        }

        public class Reader {
            public static bool IsDebug = true;
            private static System.IO.StringReader SReader;
            private static string InitText = @"




-3 -1







";
            public static string ReadLine() {
                if(IsDebug) {
                    if(SReader == null) {
                        SReader = new System.IO.StringReader(InitText.Trim());
                    }
                    return SReader.ReadLine();
                } else {
                    return Console.ReadLine();
                }
            }
        }
        public static void Main(string[] args)
        {
            Program prg = new Program();
            prg.Proc();
        }
    }