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 Python (3.4.3) (judge verdict: Wrong Answer)

def product(m, d, n):
    if (n == 0):
        return 1
    else:
        return m * product(m + d, d, n - 1)

a,b = [int(i) for i in input().split() ]
d = 1
n = abs(b) - abs(a)
multi_sum = product(a, d, n)
if multi_sum > 0:
    print("Positive")
elif multi_sum < 0:
    print("Negative")
else:
    print("Zero")