input: Write a function to calculate the absolute difference between two given numbers. The function should take two parameters and return the absolute difference.
  
  assert absolute_difference(9, 5)==4
  assert absolute_difference(-3, 7)==10
  assert absolute_difference(0, 0)==0
  assert absolute_difference(10, -2)==12
  
  def absolute_difference(A, B): 
      return abs(A - B)
output: def absolute_difference(A, B): 
      return abs(A - B)