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: ['9', '129', '467', '59', 'm', 'n', 'd', '107']

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

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

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

PROBLEM: ['m', 'w', 'f', '461']

SOLUTION:
1, 4, 6