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: ['x', '281', 'n', '385', '435', 'l', 's', '445', 'n', 'n', '133']

SOLUTION: 1, 2, 3, 4, 5, 8

PROBLEM: ['l', 'n', '477', '227', '71', 'p', 'q', '277', '135', 'i']

SOLUTION: 1, 2, 3, 4, 5, 7

PROBLEM: ['b', 'b', 'm']

SOLUTION:
-1