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', 't', 'h', 'i', 'c', '441', '117', '463', 'r']

SOLUTION: 1, 3, 4, 6, 7

PROBLEM: ['d', '395', 'd', '233', '271']

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

PROBLEM: ['53', 'x', '393', '385', 'p', '207', 'o', 't', '497']

SOLUTION:
0, 2, 3, 4, 5, 7, 8, 9