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: ['v', '105', 'p', 'w', '295', '239', '453']

SOLUTION: 0, 1, 2, 3, 4, 5, 9

PROBLEM: ['165', '219', 'r', 's', '191', 'k', '39']

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

PROBLEM: ['439', 'x', '7', 'i']

SOLUTION:
3, 4, 7, 9