In this task, you are given an input list A. You need to extract and sort the unique digits used in the list in ascending order. Return -1 if there is no digit in the list.
--------
Question: ['7', 'u', 's', '75', 't', 'o']

Answer: 5, 7


Question: ['343', 'c', '7', '271', 'm', '151', 'd', 'n', '305', 'y', 'w', '255']

Answer: 0, 1, 2, 3, 4, 5, 7


Question: ['w', '99', 'y', '39']

Answer:
3, 9