Definition: 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.
Input: ['b', '215', 'u', 'm', 'a', '173', 'x', '423', 'e', 'l']

1, 2, 3, 4, 5, 7