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: ['161', '433', '373', '225', '161', 'b', '179', '311', 'f', '325', 'y', 'c', 'h', '87']

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

PROBLEM: ['c', '21', 'k', '101']

SOLUTION:
0, 1, 2