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:
['255', 'u', 's', 'g', '445']
answer:
2, 4, 5


question:
['101', '473', '25', 'i', '117']
answer:
0, 1, 2, 3, 4, 5, 7


question:
['221', 'o', '487', 'u', 'z', 'l', '289', 'd', '261', '21']
answer:

1, 2, 4, 6, 7, 8, 9