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: ['r', 'o', 'n', '219', 'a', '419', 'x', '261', 'h', 's', '373', '155', 's', '171']

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


Question: ['z', '375', 'v', 'o', 'v', '31', 'u', 'x', 'q', 'x', '71', 'n', 'v']

Answer: 1, 3, 5, 7


Question: ['309', '439', 'p']

Answer:
0, 3, 4, 9