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:
['487', 'x']
answer:
4, 7, 8


question:
['s', 'd']
answer:
-1


question:
['l', 'v', 'c', 'n', 'x', '279', 'z', '427']
answer:

2, 4, 7, 9