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: ['143', 'i', '499', 't', '27']

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

PROBLEM: ['r', '171', 'p', '299', 'u', 'n', '421', '331', 'h', '21', 'h', 'x', '435', '327', '373']

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

PROBLEM: ['87', 'j', 'n', '29', '371', '231', 'm', '335', 'p', 'y', 'p', '217', 'v']

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