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 Haskell (GHC 7.10.3) (judge verdict: Wrong Answer)

main = do
  inputs <- map(read::[Char]->Int) <$> words <$> getLine
  let a = head inputs
      b = last inputs
      c = length $ filter(\x->x<0) [a..b]
      d = length $ filter(\x->x/=0) [a..b]
  putStr $ if d < 0 then "Zero" else judge c

judge::Int->[Char]
judge x | mod x 2 == 0 = "Positive"
        | otherwise = "Negative"