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: ['447', '77', '337', 'i', '257', '477', 'l', 'm', '357', 'k', '293', '425', 's']

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

PROBLEM: ['n', 'q', 'z', 'r', '41', '345', '115', '487', '273', 'q', '219', 'i', '23']

SOLUTION: 1, 2, 3, 4, 5, 7, 8, 9

PROBLEM: ['343', 't', '143', 'l', '429', '147']

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