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: ['c', '155', '61']

SOLUTION: 1, 5, 6

PROBLEM: ['r', '495', '383', 'd', '369', '323', 'e', 'c', '149', 'q', '487', 'q', 'c']

SOLUTION: 1, 2, 3, 4, 5, 6, 7, 8, 9

PROBLEM: ['v', 's', 't', 'l', '333', 'z', 'w', 'f', '291']

SOLUTION:
1, 2, 3, 9