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

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

PROBLEM: ['479', '381', '61', '307', 'w', 'd', '493', 'q', 'h', '373', '217', 't', '57', 'j']

SOLUTION: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9

PROBLEM: ['225', 'l', 'a']

SOLUTION:
2, 5