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 Rust (1.15.1) (judge verdict: Accepted)

use std::str::FromStr;
fn main() {
    let mut ab = String::new();
    std::io::stdin().read_line(&mut ab).ok();
    let mut it = ab.split_whitespace().map(|n| i64::from_str(n).unwrap());
    let a : i64 = it.next().unwrap();
    let b : i64 = it.next().unwrap();
    if a <= 0 && b >= 0 {
        println!("Zero");
    } else if a > 0 {
        println!("Positive");
    } else {
        if (b - a + 1) % 2 == 0 {
            println!("Positive");
        } else {
            println!("Negative");
        }
    }
}