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:
['a', '491', '477', '193', 'b', 'l', 'c']
answer:
1, 3, 4, 7, 9


question:
['85', '311', 'x', '97', 'b', '277', 's', 'a', 'v', 'o', 'a']
answer:
1, 2, 3, 5, 7, 8, 9


question:
['315', '33', '363', 'c']
answer:

1, 3, 5, 6