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', 'v', '311', 'f', '273']

SOLUTION: 1, 2, 3, 7

PROBLEM: ['291', '445', 'q', 't']

SOLUTION: 1, 2, 4, 5, 9

PROBLEM: ['167', '67', 'r', '355', 'c', 'r']

SOLUTION:
1, 3, 5, 6, 7