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: ['387', '7', '93', '105', '181']

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

PROBLEM: ['311', '147', 'a', '149', 'h']

SOLUTION: 1, 3, 4, 7, 9

PROBLEM: ['153', 'b', 'w', 'y', 'k', '385', '221', '153', 'b', '123', 'd', '151', 'y']

SOLUTION:
1, 2, 3, 5, 8