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(12, 5)==7
  assert absolute_difference(-3, 7)==10
  assert absolute_difference(-8, -2)==6
  assert absolute_difference(0, 0)==0
output: def absolute_difference(A, B): 
      return abs(A - B)