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: ['287', 'y', 'b', '79', '39', 'l']

SOLUTION: 2, 3, 7, 8, 9

PROBLEM: ['411', '367']

SOLUTION: 1, 3, 4, 6, 7

PROBLEM: ['v', '281', 'q', 'f', '463', 'r', 'q', 'w', 'j', 'd', 'o']

SOLUTION:
1, 2, 3, 4, 6, 8