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: ['i', '325', '117', 'k', 'y', 'x', '49', '349', '477', 'u', '435']

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

PROBLEM: ['217', '481', '87', 'w', 'q', 'c', 'j', '275', 'e', '49', '87', '25']

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

PROBLEM: ['k', 'c', 't']

SOLUTION:
-1