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(-9, 5)==14
  assert absolute_difference(0, 0)==0
  assert absolute_difference(3, -7)==10
  assert absolute_difference(-1, -1)==0
output: def absolute_difference(A, B):
      return abs(A - B)