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:
['455', '447', 'x', '479', 'b', '267', '339', '29', '267']
answer:
2, 3, 4, 5, 6, 7, 9


question:
['3', '181', 'o', '425', 'f', '391']
answer:
1, 2, 3, 4, 5, 8, 9


question:
['k', 'g', '279', '13', '51', '47', 'y', '17']
answer:

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