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: ['97', '147', 'j', 'm', 'c', '445']

SOLUTION: 1, 4, 5, 7, 9

PROBLEM: ['99', '245', 'c', '435', '255', 'v']

SOLUTION: 2, 3, 4, 5, 9

PROBLEM: ['v', '469', 'p']

SOLUTION:
4, 6, 9