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.

Q: ['h', '281', 'x', '471']

A: 1, 2, 4, 7, 8
****
Q: ['51', '461', '343', '15', '209', '51']

A: 0, 1, 2, 3, 4, 5, 6, 9
****
Q: ['67', 'u', 'k', '71', 'd', 'u']

A:
1, 6, 7
****