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 PyPy3 (2.4.0) (judge verdict: Runtime Error)

def slove():
    import sys
    input = sys.stdin.readline
    n, m = list(map(int, input().rstrip('\n').split()))
    lr = [list(map(int, input().rstrip('\n').split())) for _ in range(m)]
    a = [0] * (n + 2)
    for l, r in lr:
        a[l] += 1
        a[r + 1] -= 1
    t = 0
    cnt = 0
    for i in range(1, n + 1):
        t += a[i]
        if t == m:
            cnt += 1
    print(cnt)


if __name__ == '__main__':
    slove()