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: ['177', '17', '205', '25', 'n', '359', 'b', 'f', '181', 'k', '169', '483', '473', 'h']

SOLUTION: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9

PROBLEM: ['o', 'f', 'x', '239']

SOLUTION: 2, 3, 9

PROBLEM: ['t', 'b', '395', 'v', '213']

SOLUTION:
1, 2, 3, 5, 9