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

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

PROBLEM: ['s', 'd']

SOLUTION: -1

PROBLEM: ['385', '225', 'x']

SOLUTION:
2, 3, 5, 8