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:
['487', 'x']
answer:
4, 7, 8


question:
['49', 'r', '179', 'h', 'q', 'h', 'w', '187', '427', 'x', 'r']
answer:
1, 2, 4, 7, 8, 9


question:
['411', '367']
answer:

1, 3, 4, 6, 7