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: ['447', '77', '337', 'i', '257', '477', 'l', 'm', '357', 'k', '293', '425', 's']

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

PROBLEM: ['93', '277', '373', 'z', '9', 'r', '251', '207', 'v', 'n']

SOLUTION: 0, 1, 2, 3, 5, 7, 9

PROBLEM: ['225', 't', '163', '427', '381', '75']

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