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: ['p', '231', 'd', 'i', '33', '431']

Answer: 1, 2, 3, 4


Question: ['w', '19', '61', 'j', 'o', 's', 'q', '391', '281', '491', '287']

Answer: 1, 2, 3, 4, 6, 7, 8, 9


Question: ['r', '493', '115', 'r', '37', 'q', 'g', '335']

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