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: ['t', '493', 's', 'f', '279', 'f']

Answer: 2, 3, 4, 7, 9


Question: ['343', 'c', '7', '271', 'm', '151', 'd', 'n', '305', 'y', 'w', '255']

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


Question: ['h', 'd', '37', '127', '67', 'u', '463']

Answer:
1, 2, 3, 4, 6, 7