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: ['215', '391', '251', '177']

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

PROBLEM: ['q', '17', '497', '69', 'n', '25', 'a', 'j', 'c', 'j', '303', '453', 'k', 'h']

SOLUTION: 0, 1, 2, 3, 4, 5, 6, 7, 9

PROBLEM: ['401', 's', 'x', '453', '441']

SOLUTION:
0, 1, 3, 4, 5