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: ['j', '195', 'u', '55']

SOLUTION: 1, 5, 9

PROBLEM: ['459', 'd', '473', 'i', 'l', 's']

SOLUTION: 3, 4, 5, 7, 9

PROBLEM: ['g', 'o', '155', 'o', '17', '199', 'a', '149', 'j', 'z', 'z', '63', '23', 'n']

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