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

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

PROBLEM: ['p', '231', 'd', 'i', '33', '431']

SOLUTION: 1, 2, 3, 4

PROBLEM: ['q', 'w', '261', 'u', 'c', '281', '83', 'm', 's', 'e', 'a', 'f', '391']

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