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;
using System.Linq;
class AS
{
static void Main()

{
long[]a=Console.ReadLine().Split().Select(long.Parse).ToArray();
if((a[0]<0&&0<a[1])||(a[0]==0)||a[1]==0){Console.WriteLine("Zero");}

else if(a[0]<0){long y=1;for(long i=a[0];i<=a[1];i++)
{
y*=i;
}
if(y<0){Console.WriteLine("Negative");}
else if(y==0){Console.WriteLine("Zero");}
else{Console.WriteLine("Positive");}
}
else
{ulong y=1;
for(ulong i=(ulong)a[0];i<=(ulong)a[1];i++)
{
y*=i;
}
if(y<0){Console.WriteLine("Negative");}
//else if(y==0)
//{Console.WriteLine("Zero");}
else{Console.WriteLine("Positive");}
}



}}