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: ['k', '217']

Answer: 1, 2, 7


Question: ['279', 'm', '453', 's', 'x', 'g', 'i', 'x', 'd']

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


Question: ['57', 'g', 'i', 'k', '37']

Answer:
3, 5, 7