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: ['175', 'c', 'c']

SOLUTION: 1, 5, 7

PROBLEM: ['h', 'i', 'e', '319', 'g', '187', '395', 'f', '327', 'y']

SOLUTION: 1, 2, 3, 5, 7, 8, 9

PROBLEM: ['113', '113', 'm', '171', 'g', 'a', 'r', '411', 'l', 'b', '199', 'r']

SOLUTION:
1, 3, 4, 7, 9