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: ['n', '149', 'z', '37']

Answer: 1, 3, 4, 7, 9


Question: ['t', '251', 'b', '241', 'z', '255']

Answer: 1, 2, 4, 5


Question: ['169', 'o', '333']

Answer:
1, 3, 6, 9