input: Write a function to print the absolute difference between two given numbers. The function should take two parameters, A and B, and return the absolute difference between them.
  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(-2, -8)==6
output: def absolute_difference(A, B):
      return abs(A - B)