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: ['r', '233']

SOLUTION: 2, 3

PROBLEM: ['45', '95', 'y', '363', '265', '307', '309', '423']

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

PROBLEM: ['397', '395', 'y', 'b', 'g', '87', 'x']

SOLUTION:
3, 5, 7, 8, 9