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: ['s', '291', '257', 'w', '497', '309']

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


Question: ['c', '471', 'l', 'z', '23', 'c', '43', 'o', '175', 'w', 'c', 'p', '431']

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


Question: ['353', '195', '297', '175', 'u', 'p', 'r', 'l']

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