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:
['h', '281', 'x', '471']
answer:
1, 2, 4, 7, 8


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


question:
['k', 'k', 'o', 'c', 'p', '301', 'o']
answer:

0, 1, 3