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: ['z', 'e', '75', '379', 'c', 'f', 'g', '381', 'l', 'u', '197', '489']

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

PROBLEM: ['315', '459', 'j', 's', 'w', '337', 'v', '87']

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