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: ['v', 'q', '139', '79', '149', '469', 'g', '239', '221', 'v', '77']

Answer: 1, 2, 3, 4, 6, 7, 9


Question: ['389', 'v', '17', 'n', 'm']

Answer: 1, 3, 7, 8, 9


Question: ['481', '143', '421', 't', 'u', '177', '103', 'l', 'x', '465', '123', '69', '7', 'p']

Answer:
0, 1, 2, 3, 4, 5, 6, 7, 8, 9