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: ['477', 'a', 'n', 'r', '457', 'g', 'c']

Answer: 4, 5, 7


Question: ['x', 's', '497', '239', '197', '191', '7', 'h', '191', '281', '55', '317', '407', '201', 'v']

Answer: 0, 1, 2, 3, 4, 5, 7, 8, 9


Question: ['91', 'a', 'v', '89', '295', '409']

Answer:
0, 1, 2, 4, 5, 8, 9