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', '351', 'g', 'k', '29', '15', '411', '97', 'r', '27', '279']
answer:
1, 2, 3, 4, 5, 7, 9


question:
['157', '481', 'n', 't', 'd', 'j']
answer:
1, 4, 5, 7, 8


question:
['g', '119', 'h']
answer:

1, 9


