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:
['u', 'z', 'p', '99', 'b']
answer:
9


question:
['285', 'h', '231', 'l', 'd', 'k', '309', '345', 'k', 'p', '351', '93', 'b', 'w']
answer:
0, 1, 2, 3, 4, 5, 8, 9


question:
['435', 'y', '217', '199', '111', 'g']
answer:

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