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: ['157', '481', 'n', 't', 'd', 'j']

SOLUTION: 1, 4, 5, 7, 8

PROBLEM: ['235', '17', 'k', 'h', 'o', 'g', '97', 'h', '165']

SOLUTION: 1, 2, 3, 5, 6, 7, 9

PROBLEM: ['t', '53', 'a', '369', '279', 'i']

SOLUTION:
2, 3, 5, 6, 7, 9