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: ['345', 'h', '9']

SOLUTION: 3, 4, 5, 9

PROBLEM: ['375', '457', '423', 'q', 't']

SOLUTION: 2, 3, 4, 5, 7

PROBLEM: ['o', '373', '123', '87', 'x']

SOLUTION:
1, 2, 3, 7, 8