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: ['381', 'l', 'z', '323', 'x', '247', '11']

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

PROBLEM: ['451', '465', '461', '361', 'i', '379', '271', '103', '15', '419', '329', 'g', 'j', '171']

SOLUTION: 0, 1, 2, 3, 4, 5, 6, 7, 9

PROBLEM: ['p', 'o', '287', 'e', '201', '277', 'x', '377', 't']

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