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: ['s', '391', 'z', '67', '371', '195', '77', '373', 'g', '249', 'm']

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


Question: ['157', 'k', 'o', 'a', '279', 'g']

Answer: 1, 2, 5, 7, 9


Question: ['297', '19', '171']

Answer:
1, 2, 7, 9