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: ['73', '215', '389', '381', 'e', 'v', 'j', 'l', 'r']

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

PROBLEM: ['b', '351', 'g', 'k', '29', '15', '411', '97', 'r', '27', '279']

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

PROBLEM: ['i', '127', 'j', 'z', '489', '359', 'i', 'j', 'y', 'p', 'm', 'z']

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