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: ['255', 'u', 's', 'g', '445']

Answer: 2, 4, 5


Question: ['v', 'r', '67', '49']

Answer: 4, 6, 7, 9


Question: ['121', 'b', '297', 'g', 'r', 'a', 'f', '243', '323', '289', 'a', 'i', '255', 'o']

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