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: ['z', 't', 'm', '295', '459', 'r', 'k', '149', '263', '5', '57', '455']

SOLUTION: 1, 2, 3, 4, 5, 6, 7, 9

PROBLEM: ['a', '327', '317']

SOLUTION:
1, 2, 3, 7