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: ['q', 'y', '49', '497', 'a', 'f', 'v', 'x', 'f', '347', '183', '489']

SOLUTION: 1, 3, 4, 7, 8, 9

PROBLEM: ['219', 'v', '295', '291', 'n', 'a', '133', 'a', 'y', 'i', 'e', '235', '461']

SOLUTION: 1, 2, 3, 4, 5, 6, 9

PROBLEM: ['t', '67', 'z', 'u', 'q']

SOLUTION:
6, 7