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:
['t', 'v', '469', 'n']
answer:
4, 6, 9


question:
['353', '195', '297', '175', 'u', 'p', 'r', 'l']
answer:
1, 2, 3, 5, 7, 9


question:
['u', '207', 'q', '371', 's', '51', '217', 'q', '255', '9', '109', 'l', 'b', 'w']
answer:

0, 1, 2, 3, 5, 7, 9