TASK 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.
PROBLEM: ['i', 'e', '17', 'q', '15', 'v']

SOLUTION: 1, 5, 7

PROBLEM: ['j', '379', 'x', '51', 'k', 'r', 'i', '233', '363', '69', 'v', 'q', '151']

SOLUTION: 1, 2, 3, 5, 6, 7, 9

PROBLEM: ['l', 'r']

SOLUTION:
-1