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: ['187', '461', 'b']

Answer: 1, 4, 6, 7, 8


Question: ['247', 's', 'y', 'c', '421']

Answer: 1, 2, 4, 7


Question: ['f', 'j']

Answer:
-1


