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:
['t', 'y', '331']
answer:
1, 3


question:
['449', '427', 'g', '397', '439', 'f', 'b', 'z', 't', 'f', 's', '379', 'o']
answer:
2, 3, 4, 7, 9


question:
['t', '295', '371', 'b', '137', '155', 'd', 'f']
answer:

1, 2, 3, 5, 7, 9