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', 'o', 'c', 'j', 'g', '249', 's', 'b', 'f', '359', '107', 'i']

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


Question: ['149', 'o', '237', 't', 'k', 'w']

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


Question: ['z', 'v', '309', '73', 'k', '337', 'k', 'j']

Answer:
0, 3, 7, 9