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: ['u', '341', '151', '1', '157', '211', '189']

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

PROBLEM: ['119', '189', 'k', 'e', '425', '21', '245']

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

PROBLEM: ['e', 'b', '147', '439', 'k']

SOLUTION:
1, 3, 4, 7, 9