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: ['s', '443', '239', 't', '99']

SOLUTION: 2, 3, 4, 9

PROBLEM: ['93', 'z', '495', 'l', '65', '233', 'h', 'm', 'f', '249', 'w', '35', '337', 'j', 'm']

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

PROBLEM: ['z', 'b', 'c', 'l', '453', 'h', '215', '447', '487', 'p', 'y', 'v']

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