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: ['u', 'r']

Answer: -1


Question: ['395', 'p', '373']

Answer: 3, 5, 7, 9


Question: ['w', 'o', '467', 'v', 'x', 'o']

Answer:
4, 6, 7


