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:
['k', '373', 'b', '305', 'i', 'n', 'z', 'm', 'c']
answer:
0, 3, 5, 7


question:
['163', '375', 'e', 'g', '115', '445', 'c', '393', 'm', '59']
answer:
1, 3, 4, 5, 6, 7, 9


question:
['171', '435', 't', '429', 'g']
answer:

1, 2, 3, 4, 5, 7, 9


