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:
['71', '7', '341', '199', 'z', 'x', '201']
answer:
0, 1, 2, 3, 4, 7, 9


question:
['b', '179', '321', '387', '33', 't', 'q', 'n', 'f', 'f']
answer:

1, 2, 3, 7, 8, 9