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.

Example Input: ['411', '367']
Example Output: 1, 3, 4, 6, 7

Example Input: ['487', '355', 'm', 's', '367', 'n', '203', 'x', 't', 'v', 'd', '251']
Example Output: 0, 1, 2, 3, 4, 5, 6, 7, 8

Example Input: ['k', 'b', 'k', 'l', '441', 'b', '115', 'd', 'b', 'r', '115', 'k', 'a']
Example Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
1, 4, 5

