input: Write a function that takes a list of numbers from 1 to 8 and prints each number's cubic value. The function should handle the input list and print the cubic values directly. 
  
  def print_cubic_values(numbers):
      for num in numbers:
          print(num**3)
  
  assert print_cubic_values([1, 2, 3, 4, 5, 6, 7, 8])==None
output: def print_cubic_values(numbers):
      for num in numbers:
          print(num**3)