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: ['497', '21', '239', '487', '149', 'q']

SOLUTION: 1, 2, 3, 4, 7, 8, 9

PROBLEM: ['k', '217']

SOLUTION: 1, 2, 7

PROBLEM: ['d', '95', '271', '123', 'n', '277', '117', 's', '461', 'c', 'a']

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