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: ['357', '269', '105', '315', 'c', '301', 'v', '441', '415', 't', 'a', 'o', 'u', '23', 'n']

Answer: 0, 1, 2, 3, 4, 5, 6, 7, 9


Question: ['497', '247', 'v', '327', '237', '257', '475', 's', '335', 'k']

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


Question: ['87', '223']

Answer:
2, 3, 7, 8