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: ['l', '201', 's', 'y', 'b', '395', '19']

SOLUTION: 0, 1, 2, 3, 5, 9

PROBLEM: ['127', 'd', '479', 'v', '213', 'm', 'z', '151', 'h', '455']

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

PROBLEM: ['l', 'v', 'h', 'g', '107', '439', '73', '367']

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