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: ['c', 'h', '151', 'g', 'd', 'd', 'k', '37']

Answer: 1, 3, 5, 7


Question: ['p', 'u', '309', 'x', '223', 'b', 'r', '261']

Answer:
0, 1, 2, 3, 6, 9