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', 'q']

SOLUTION: 1, 7, 9

PROBLEM: ['149', '129', 'k']

SOLUTION: 1, 2, 4, 9

PROBLEM: ['347', '161', 'q']

SOLUTION:
1, 3, 4, 6, 7