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: ['c', 'u', 'b', '347', '191']

SOLUTION: 1, 3, 4, 7, 9

PROBLEM: ['k', '135', '297']

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

PROBLEM: ['27', '329', 'f', 'z', '419', '415', 'm', 'i']

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