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', '373', 'b', '305', 'i', 'n', 'z', 'm', 'c']

SOLUTION: 0, 3, 5, 7

PROBLEM: ['b', '343', '149', 'h', 'w', 'j', 'd', 'r', '461', 'q', '265', '329', '499', 'r', '291']

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

PROBLEM: ['219', 'k']

SOLUTION:
1, 2, 9