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:
['b', 'm', '471']
answer:
1, 4, 7


question:
['229', 'q', 'e']
answer:
2, 9


question:
['i', '149', '391', 'a', 'p', '341', '155', 'h', '473', 'm']
answer:

1, 3, 4, 5, 7, 9