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:
['157', 'k', 'o', 'a', '279', 'g']
answer:
1, 2, 5, 7, 9


question:
['149', 'o', '237', 't', 'k', 'w']
answer:
1, 2, 3, 4, 7, 9


question:
['k', 'h', 'd', '327', '407', '343', 't', 'b']
answer:

0, 2, 3, 4, 7