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:
['299', '371', '313', '17', 't', 'q']
answer:
1, 2, 3, 7, 9


question:
['n', 'm', 'u', '267']
answer:
2, 6, 7


question:
['t', 'i', 'n', 'b', 'w', 'k', 'p', 'x', 'z', '65', 'y']
answer:

5, 6