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:
['f', '291', '145', 'd', 'z', '355', 'r']
answer:
1, 2, 3, 4, 5, 9


question:
['t', 'v', '469', 'n']
answer:
4, 6, 9


question:
['471', '497']
answer:

1, 4, 7, 9