Teacher: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.
Teacher: Now, understand the problem? Solve this instance: ['363', 'x', '383', '45', '439', '293', '19', '355', 'a', 'y', '489', 'a', '119', 'g']
Student:
1, 2, 3, 4, 5, 6, 8, 9