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:
['1', 'm']
answer:
1


question:
['h', 't', '371', 'e', '153', 'b']
answer:
1, 3, 5, 7


question:
['339', 'm']
answer:

3, 9


