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', '103', '349', '203', 'b', 'z', 'i', '337', 'y', '137', '77', 'p', 'k']

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


Question: ['v', 'j', 'l', 'f', 'n', '185', 'x', '367']

Answer: 1, 3, 5, 6, 7, 8


Question: ['337', '477', '1', 'n', 'h']

Answer:
1, 3, 4, 7