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', 'n', '477', '227', '71', 'p', 'q', '277', '135', 'i']

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

PROBLEM: ['s', '95', 'j', '173', '437', '143', 'n', '357', 'w', '239', '219']

SOLUTION: 1, 2, 3, 4, 5, 7, 9

PROBLEM: ['245', '419', '215', 'z', '181', 'e', 'p', 'v', '445', '297', 'i']

SOLUTION:
1, 2, 4, 5, 7, 8, 9