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: ['407', 'a', 'l', '307', 'a']

Answer: 0, 3, 4, 7


Question: ['x', '445']

Answer:
4, 5