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: ['51', '461', '343', '15', '209', '51']

Answer: 0, 1, 2, 3, 4, 5, 6, 9


Question: ['z', 'v', 't', 'm', '51', 'e', 'l', 'l', '83', '301', '21', '347', 'm', '41', 'b']

Answer: 0, 1, 2, 3, 4, 5, 7, 8


Question: ['l', 'z', 'x', 'n', 'c', 'f', 'j', 'f', 'w', '139']

Answer:
1, 3, 9