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

SOLUTION: 1, 2, 4, 9

PROBLEM: ['239', '439']

SOLUTION: 2, 3, 4, 9

PROBLEM: ['485', 'd', 'o', 'j', 'f', '121', 'e', '301']

SOLUTION:
0, 1, 2, 3, 4, 5, 8