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:
['p', 't', '211', 'r', '439', 'h', 'g', 'c', '299', '371']
answer:
1, 2, 3, 4, 7, 9


question:
['k', '135', '297']
answer:
1, 2, 3, 5, 7, 9


question:
['321', 'c']
answer:

1, 2, 3


