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: Accepted)

import Control.Applicative

main = do
  [a,b] <- map read.words <$> getLine :: IO [Int]
  case (a,b) of
    (a,b) | a*b < 0 -> putStrLn "Zero"
          | a > 0 && b > 0 -> putStrLn "Positive"
          | odd (min b 0 - a) -> putStrLn "Positive"
          | otherwise -> putStrLn "Negative"