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.
--------
Question: ['339', '473', '485']

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


Question: ['g', 'j', '239', 'w', 'q', 'm', 'a', 'l', 'n', 'p', 'i', 'r']

Answer: 2, 3, 9


Question: ['r', 'i']

Answer:
-1