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: ['379', '485', '415', '37', '221', '125', '245', '87', 'a']

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

PROBLEM: ['k', '217']

SOLUTION: 1, 2, 7

PROBLEM: ['141', 'c', 'k', 'p', 'v', 'y', 'd']

SOLUTION:
1, 4