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:
['479', '205', 'e', 'c', '57', 'm', 'i', '33', 'f', '45', 'z']
answer:
0, 2, 3, 4, 5, 7, 9


question:
['p', 'p', '91']
answer:
1, 9


question:
['x', 's', '357', '109', 'x', 'n', 'f', 'm', 'a', 'u', '455', 'c']
answer:

0, 1, 3, 4, 5, 7, 9