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: ['a', 'n', '423', 'y', 'y', 'u', '55', 'y', '295', '73', 't', 'p']

SOLUTION: 2, 3, 4, 5, 7, 9

PROBLEM: ['211', 'v', 'a', '445', '185', '135', 'v', 'w', 'b', '155', '315', '1']

SOLUTION: 1, 2, 3, 4, 5, 8

PROBLEM: ['209', 'k', '445', '285']

SOLUTION:
0, 2, 4, 5, 8, 9