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:
['x', 'a', '381', 'k', 'n', 'm', '267', 'r', '193', 'f', 'h', 'r', '327', 'i', 'h']
answer:
1, 2, 3, 6, 7, 8, 9


question:
['v', 'r', '67', '49']
answer:
4, 6, 7, 9


question:
['421', '83', 'g', '447', 't', '277', 'p']
answer:

1, 2, 3, 4, 7, 8