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:
['239', '439']
answer:
2, 3, 4, 9


question:
['f', 't', 'a', '163', '297', '97', '487', '341', '193']
answer:
1, 2, 3, 4, 6, 7, 8, 9


question:
['a', 'r', '275', '417', 'o', '151', '79', 'e', '147']
answer:

1, 2, 4, 5, 7, 9