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: ['247', 's', 'y', 'c', '421']

Answer: 1, 2, 4, 7


Question: ['y', '449', 'g', '345', '167', 'q', 'k']

Answer: 1, 3, 4, 5, 6, 7, 9


Question: ['s', '53', 's', 'x', '187', '55']

Answer:
1, 3, 5, 7, 8