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: ['e', '325', '377', 'v', '35', 'n', '125', '195']

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


Question: ['475', '19', 'k', '307', '417']

Answer: 0, 1, 3, 4, 5, 7, 9


Question: ['437', '377']

Answer:
3, 4, 7