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: ['h', '475', 'x', '53', '461', 'c']

SOLUTION: 1, 3, 4, 5, 6, 7

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

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

PROBLEM: ['o', 'l']

SOLUTION:
-1