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: ['t', '437', 'o', 'w', 'x', 'e', 'r', 'r', '149', 'd', '391']

Answer: 1, 3, 4, 7, 9


Question: ['u', 'c', 'f', 'z', '51', '301', 'q', '275']

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


Question: ['v', 'k']

Answer:
-1