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: ['121', 'm', 'n', '143', '281', 'c', 'j']

SOLUTION: 1, 2, 3, 4, 8

PROBLEM: ['175', 'c', 'c']

SOLUTION: 1, 5, 7

PROBLEM: ['k', 'r']

SOLUTION:
-1