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 Scala (2.11.7) (judge verdict: Accepted)

import java.util.Scanner

import scala.annotation.tailrec

object Util {
  @tailrec
  def loop(start: Int, end: Int)(f: Int => Unit) {
    if (start < end) {
      f(start)
      loop(start + 1, end)(f)
    }
  }
}

object Main {
  def main(args: Array[String]): Unit = {
    //nextLineとnextを同時に使ったら死ぬ
    val sc = new Scanner(System.in)
    val a, b = sc.nextLong()
    if (a * b <= 0) {
      println("Zero")
    } else if (a + b > 0) {
      println("Positive")
    } else {
      if ((b - a) % 2 == 0) {
        println("Negative")
      } else {
        println("Positive")
      }
    }

  }
}