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: ['71', 't', '267', 'x', 'l', '95', '439', '51', 'i', '497', '469', 'k', '341', 'y']

Answer: 1, 2, 3, 4, 5, 6, 7, 9


Question: ['489', 'y', 's', 'x', '203', 't', 'y', '461', 'v', 'k', '371', 'e']

Answer: 0, 1, 2, 3, 4, 6, 7, 8, 9


Question: ['321', 'e', 'r']

Answer:
1, 2, 3