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: ['23', 'p', '409', '305', 'z', 'q', '295', '391']

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


Question: ['487', 'x']

Answer: 4, 7, 8


Question: ['83', 'p', '489', 'r', '497', 'b', '35', '493']

Answer:
3, 4, 5, 7, 8, 9