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: ['205', '107', 'z']

SOLUTION: 0, 1, 2, 5, 7

PROBLEM: ['u', '207', 'q', '371', 's', '51', '217', 'q', '255', '9', '109', 'l', 'b', 'w']

SOLUTION: 0, 1, 2, 3, 5, 7, 9

PROBLEM: ['f', '215', 'm', 'v', 'y', 'v', 'g', 'c', '145', 'z']

SOLUTION:
1, 2, 4, 5