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: ['43', 'd']

SOLUTION: 3, 4

PROBLEM: ['b', '5', '87', 'k', 'g', '443']

SOLUTION:
3, 4, 5, 7, 8