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


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


question:
['355', '365', 'y', 'v', '267', 'd']
answer:

2, 3, 5, 6, 7