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:
['437', '377']
answer:
3, 4, 7


question:
['z', '273', '447', 'h']
answer:
2, 3, 4, 7


question:
['373', '357', '459', 'z', 'r', '499', 'u', '195', 'd', '193', '227']
answer:

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