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: ['219', '127', '449', 'u', 'g']

Answer: 1, 2, 4, 7, 9


Question: ['x', '325', 'i', 'n', 'i', 'w', 't']

Answer: 2, 3, 5


Question: ['y', 'b', '273', '453', '433']

Answer:
2, 3, 4, 5, 7