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: ['k', '373', 'b', '305', 'i', 'n', 'z', 'm', 'c']

Answer: 0, 3, 5, 7


Question: ['487', 'x']

Answer: 4, 7, 8


Question: ['179', '67', 'n', '215', 's', 'k', '299', '269', '235', '243', 's', '453']

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