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: ['479', '205', 'e', 'c', '57', 'm', 'i', '33', 'f', '45', 'z']

SOLUTION: 0, 2, 3, 4, 5, 7, 9

PROBLEM: ['j', 'a', '29', 'y', 's', '107', '149', '499', '37', 'o', '289', 't']

SOLUTION: 0, 1, 2, 3, 4, 7, 8, 9

PROBLEM: ['y', '87', 't', '463']

SOLUTION:
3, 4, 6, 7, 8