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: ['d', '395', 'd', '233', '271']

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


Question: ['r', '233']

Answer: 2, 3


Question: ['c', 'e', '479', 'e', 'w', '225', '21', 'p', 'c', 'l']

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