In Python: Write a function diff(vals1, vals2) that takes as inputs two arbitrary lists of non-negative integers vals1 and vals2 and uses recursion to construct and return a new list in which each element is the the absolute value of the difference of the corresponding elements from the original lists. For example:

>>> diff([3, 4, 2, 5], [7, 2, 9, 5]) result: [4, 2, 7, 0]