output_description: If the product is positive, print `Positive`. If it is negative, print
  `Negative`. If it is zero, print `Zero`.
  
  * * *
input_description: The input is given from Standard Input in the following format:
  
      
      
      a b
attempt: import sys
  # import numpy as np 
   
  def main():
      a, b = map(int, sys.stdin.read().split())
   
      if 0 < a:
          ans = 'Positive'
      elif 0 <= b:
          ans = 'Zero'
      else:
          if (b - a + 1) % 2 == 0:
              ans = 'Positive'
          else:
              ans = 'Negative'
      
      print(ans)
   
  if __name__ == '__main__':
      main(
problem_description: 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.
samples: [{"input": "1 3", "output": "Positive\n    \n\n1\u00d72\u00d73=6 is positive.\n\n* * *"}, {"input": "-3 -1", "output": "Negative\n    \n\n(-3)\u00d7(-2)\u00d7(-1)=-6 is negative.\n\n* * *"}, {"input": "-1 1", "output": "Zero\n    \n\n(-1)\u00d70\u00d71=0."}]