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:
['k', 'x', '299', 'a', 'y', '105', 's', '249', 'g', '439', 'k', '1', 'h', 'd', '43']
answer:
0, 1, 2, 3, 4, 5, 9


question:
['c', 'u', 'b', '347', '191']
answer:
1, 3, 4, 7, 9


question:
['n', 'w', 'u', '279', 't', 'x', '451', 'n', '81', '53']
answer:

1, 2, 3, 4, 5, 7, 8, 9