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: ['e', '307', '191', 'k', 'o', 'j', '99']

Answer: 0, 1, 3, 7, 9


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

Answer: 1, 4, 6, 7, 8


Question: ['375', '79', 'j']

Answer:
3, 5, 7, 9