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', '211', 'h', '99']
answer:
1, 2, 9


question:
['g', '185', '73', 'h', '455', '333', 'l', '403', 'k', 'e', '77', '429', '423', '453']
answer:
0, 1, 2, 3, 4, 5, 7, 8, 9


question:
['307', 'v', '237', '67']
answer:

0, 2, 3, 6, 7