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 Go (1.6) (judge verdict: Wrong Answer)

package main

import "fmt"

func main(){
	var a, b int
	var ans int
	fmt.Scan(&a, &b)
	ans = a
	for i := a + 1 ; i <= b ; i++{
		ans *= int(i)
	}

	if 0 < a{
		fmt.Println("Positive")
	}else if a < 0 && 0 < b {
		fmt.Println("Zero")
	}else if b - a + 1 % 2 == 0 {
		fmt.Println("Positive")
	}else{
		fmt.Println("Negative")
	}
}