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:
['t', '251', 'b', '241', 'z', '255']
answer:
1, 2, 4, 5


question:
['s', '95', 'j', '173', '437', '143', 'n', '357', 'w', '239', '219']
answer:
1, 2, 3, 4, 5, 7, 9


question:
['h', 'h', 'e', 'm', '67', 'k', '273', 'a']
answer:

2, 3, 6, 7