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:
['c', '317', 'z', 'z', 'h', '227', '439', 'x', 'f']
answer:
1, 2, 3, 4, 7, 9


question:
['445', '91', '141', '185', 'b', 'k', 'f', 'l', 'i', '229', 't', 'v']
answer:
1, 2, 4, 5, 8, 9


question:
['479', '137', 'c', '3']
answer:

1, 3, 4, 7, 9