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: Wrong Answer)

<?php
error_reporting(0);
$stdin = file_get_contents('php://stdin');
$line = explode("\n",$stdin);
$fi = 0;
$cnt = 0;
$list = array();
$key = new stdclass();
foreach($line as $l) {
  if (empty($l)) continue;
  if ($fi == 0) {
    $a = explode(" ",$l);
    $key->A = $a[0];
    $key->B = $a[1];
    $fi++;
    continue;
  }
  if ($fi > 0) {
    $a = explode(" ",$l);
    $key->D=$a;
  }
}
if (($key->A == -1) || ($key->A == 0) || ($key->B == 0)) {
  printf("ZERO\n");
  exit;
}
if ((($key->A < -1) && ($key->B > 0))|| (($key->A > 0) && ($key->B > 0))) {
  printf("Positive\n");
}
else {
  printf("Negative\n");
}