input: def is_cube_number(a):
      '''
      Write a function that receives an integer a and returns True 
      if this integer is a perfect cube of another integer.
      Note: you can assume the input is always valid.
      Examples:
      is_cube_number(1) ==> True
      is_cube_number(2) ==> False
      is_cube_number(-1) ==> True
      is_cube_number(64) ==> True
      is_cube_number(0) ==> True
      is_cube_number(180) ==> False
      '''
output:     import math
      if a == 0:
          return True
      abs_a = abs(a)
      cube_root = round(abs_a ** (1/3))
      return cube_root ** 3 == abs_a