instruction:
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:
['397', 'x', 'e', '179', '105', '381']
answer:
0, 1, 3, 5, 7, 8, 9


question:
['q', 'g', 'z', '309']
answer:
0, 3, 9


question:
['x', '429', '245', '61']
answer:

1, 2, 4, 5, 6, 9