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: ['197', 'p', 'e', '217', '327', '439', '59', 'o', '355', 'z']

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

PROBLEM: ['q', 'a', '149']

SOLUTION: 1, 4, 9

PROBLEM: ['z', '169', 'r', 'r', 'w', 'q', '231', 'u', 'n']

SOLUTION:
1, 2, 3, 6, 9