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: ['359', '233', '455', '449', 'h']

SOLUTION: 2, 3, 4, 5, 9

PROBLEM: ['255', '19', '335', '483', 'r', 'c', 'r', 'o', '189', '71', '379', 'l', 'b']

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

PROBLEM: ['499', '57', '171', 'w', '205', '51']

SOLUTION:
0, 1, 2, 4, 5, 7, 9