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: ['b', 'r', 'n', '89', '379', '283', '27', 's', '361', 'm', 'l']

SOLUTION: 1, 2, 3, 6, 7, 8, 9

PROBLEM: ['j', 'k', 'k', 'p', '355', 'i']

SOLUTION:
3, 5