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:
['c', 'h', '151', 'g', 'd', 'd', 'k', '37']
answer:
1, 3, 5, 7


question:
['i', '485', '109', 'e', '15', '461', 'r', 'l', '223', '327']
answer:
0, 1, 2, 3, 4, 5, 6, 7, 8, 9


question:
['305', 'p', 'm', '261']
answer:

0, 1, 2, 3, 5, 6