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: ['y', '101', 'g', 'c', 'z']

SOLUTION: 0, 1

PROBLEM: ['473', '449', '357', 'p', 'p', 'e', '377', '77']

SOLUTION: 3, 4, 5, 7, 9

PROBLEM: ['385', 'b', 'c']

SOLUTION:
3, 5, 8

