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: ['307', 'y', 'p', '59', 'e', '25', '85', 'h', '123', 'f', '305']

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

PROBLEM: ['i', '249', '287']

SOLUTION: 2, 4, 7, 8, 9

PROBLEM: ['e', '473', '389', 'n']

SOLUTION:
3, 4, 7, 8, 9