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:
['o', '235', '479', 'e', '199', 'c', '25', '59', 'g', '415', '201', '129', 'a', 'i', 'c']
answer:
0, 1, 2, 3, 4, 5, 7, 9


question:
['r', '171', 'p', '299', 'u', 'n', '421', '331', 'h', '21', 'h', 'x', '435', '327', '373']
answer:
1, 2, 3, 4, 5, 7, 9


question:
['g', 't', '31', 't', 's']
answer:

1, 3