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: ['l', '201', 's', 'y', 'b', '395', '19']

SOLUTION: 0, 1, 2, 3, 5, 9

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

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

PROBLEM: ['e', 'c', '405', '461', 'v', 'y', 'j', 'f']

SOLUTION:
0, 1, 4, 5, 6