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: ['375', '457', '423', 'q', 't']

Answer: 2, 3, 4, 5, 7


Question: ['s', '291', '257', 'w', '497', '309']

Answer: 0, 1, 2, 3, 4, 5, 7, 9


Question: ['f', 'a', 'o', 'l', 'n', 'w', '481', 'c']

Answer:
1, 4, 8