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 PHP (5.6.30) (judge verdict: Accepted)

<?php
list($a,$b) = explode(" ",trim(fgets(STDIN)));
if($a < 0){
    if($b < 0){
        if(($b + $a) % 2 == 0){
            echo "Negative";
        }else{
            echo "Positive";
        }
    }else{
        echo "Zero";
    }
}elseif($a == 0){
    echo "Zero";
}else{
    echo "Positive";
}
?>