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: ['23', 'p', '409', '305', 'z', 'q', '295', '391']

SOLUTION: 0, 1, 2, 3, 4, 5, 9

PROBLEM: ['177', '323', 'q', 'e', 'x', 'p', '3', 'c', 'e', '23', 's', '407', 'l', '21', 'z']

SOLUTION: 0, 1, 2, 3, 4, 7

PROBLEM: ['253', 'm', 'h', '105', '261', 'u', 'b', '361', '457', '169', 'l', 'y', 'l', '281']

SOLUTION:
0, 1, 2, 3, 4, 5, 6, 7, 8, 9