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:
['a', '491', '477', '193', 'b', 'l', 'c']
answer:
1, 3, 4, 7, 9


question:
['t', '437', 'o', 'w', 'x', 'e', 'r', 'r', '149', 'd', '391']
answer:
1, 3, 4, 7, 9


question:
['395', '47', '439', 'w', 's', 'd', '387', 's', '63', 'f', '421', '349', '91', '57', 'm']
answer:

1, 2, 3, 4, 5, 6, 7, 8, 9