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:
['o', 'f', 'm', 'w', 'w', 'y', 'b']
answer:
-1


question:
['343', 'c', '7', '271', 'm', '151', 'd', 'n', '305', 'y', 'w', '255']
answer:
0, 1, 2, 3, 4, 5, 7


question:
['c', 'w', '367', '43', '399', '303', '73']
answer:

0, 3, 4, 6, 7, 9


