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: ['287', 'y', 'b', '79', '39', 'l']

Answer: 2, 3, 7, 8, 9


Question: ['h', '477', 'w', '315', 'k', 'd', '367', '411', '207', 'b', '81', 'k', 'f', '107', '103']

Answer: 0, 1, 2, 3, 4, 5, 6, 7, 8


Question: ['o', 'j', '239', 't', '221', 'n', 'e', '105', '307', '321', '271', 'k']

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