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.
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Question: ['257', '111', 'g', '277', '473', '105', 'x', '217']

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


Question: ['r', 'u', '83', 'x', '155', '89', 'c', '391', '41', 'o', 'i', '161']

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


Question: ['149', '417']

Answer:
1, 4, 7, 9