input: Write a function to print 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(3, -2)==5
  assert absolute_difference(-7, -1)==6
  assert absolute_difference(0, 0)==0
output: def absolute_difference(A, B): 
      return abs(A - B)