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', '355', 'm', 's', '367', 'n', '203', 'x', 't', 'v', 'd', '251']
answer:
0, 1, 2, 3, 4, 5, 6, 7, 8


question:
['z', '273', '447', 'h']
answer:
2, 3, 4, 7


question:
['371', 'c', 'y', 'x', '473', '7', 's']
answer:

1, 3, 4, 7