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:
['w', '13', 'b', '455', 'b', 'k']
answer:
1, 3, 4, 5


question:
['149', 'o', '237', 't', 'k', 'w']
answer:
1, 2, 3, 4, 7, 9


question:
['l', '171', '187', '311', 'f', 'a', '413', 'b', 'a', 'u', '115']
answer:

1, 3, 4, 5, 7, 8