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: ['k', 'a', '437', '461', 'b', '341', '175']

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


Question: ['25', 'b', '455', 'n', '305', '271']

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


Question: ['35', 'u', 'u', 'p', '471', 'j', '355', 'u', '423', '7', 'm']

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