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: ['45', 'n', 'u', '199', 'y', 'w']

Answer: 1, 4, 5, 9


Question: ['287', 'y', 'b', '79', '39', 'l']

Answer: 2, 3, 7, 8, 9


Question: ['227', 'x', 'w']

Answer:
2, 7