input: Write a function to calculate the absolute difference between two given numbers. If the input numbers are the same, return 0.
  
  def absolute_difference(A, B): 
      return abs(A - B) 
  
  assert absolute_difference(9, 5) == 4
  assert absolute_difference(7, 7) == 0
  assert absolute_difference(-3, 8) == 11
  assert absolute_difference(-5, -1) == 4
  assert absolute_difference(0, 0) == 0
output: def absolute_difference(A, B): 
      return abs(A - B)