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: ['189', 'z']

SOLUTION: 1, 8, 9

PROBLEM: ['k', 'a', '437', '461', 'b', '341', '175']

SOLUTION: 1, 3, 4, 5, 6, 7

PROBLEM: ['201', 'u', '269', '145', '87', 'd', '207', 't', 'r']

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