input: Write a function to calculate and return the absolute difference between two given numbers.
  def absolute_difference(A, B):
      return abs(A - B)
  
  assert absolute_difference(9, 5) == 4
  assert absolute_difference(0, 0) == 0
  assert absolute_difference(-5, 5) == 10
  assert absolute_difference(-10, -20) == 10
output: def absolute_difference(A, B):
      return abs(A - B)