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: ['69', 'b', 'q', 'f', 'k', '467', 'w', '413', '393', '407', 's', '435', 'i', '3']
Student:
0, 1, 3, 4, 5, 6, 7, 9