input: Write a function to print the absolute difference between two given numbers. The function should take two arguments, `A` and `B`, and print the absolute difference between them. If the function is called with no arguments, it should print a message indicating that two arguments are required.
  
  def absolute_difference(A, B): 
      if A is None or B is None:
          return "Two arguments are required."
      return abs(A - B) 
    
  assert absolute_difference(9, 5) == 4
  assert absolute_difference(10, 15) == 5
  assert absolute_difference(-3, -7) == 4
  assert absolute_difference(None, 5) == "Two arguments are required."
  assert absolute_difference(10, None) == "Two arguments are required."
  assert absolute_difference(None, None) == "Two arguments are required."
output: def absolute_difference(A, B): 
      if A is None or B is None:
          return "Two arguments are required."
      return abs(A - B)