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: ['k', '217']

SOLUTION: 1, 2, 7

PROBLEM: ['y', 'o', '287', 'm', 's', '61']

SOLUTION: 1, 2, 6, 7, 8

PROBLEM: ['j', '463', 'z', '35', 'w', '191', '333', 'a']

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