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: ['j', 'k']

SOLUTION: -1

PROBLEM: ['389', 'v', '17', 'n', 'm']

SOLUTION: 1, 3, 7, 8, 9

PROBLEM: ['o', '449', 'a', '273', 'w']

SOLUTION:
2, 3, 4, 7, 9