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', 'e', '187', '153', 'a', '253', 'f']

Answer: 1, 2, 3, 5, 7, 8


Question: ['7', 'n', '443', '131', '189', '187', '261', '451', '449', 'o', 'i', 't', '15']

Answer: 1, 2, 3, 4, 5, 6, 7, 8, 9


Question: ['g', 'v']

Answer:
-1