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: ['213', '321', 'z']

SOLUTION: 1, 2, 3

PROBLEM: ['n', 'm', 'u', '267']

SOLUTION: 2, 6, 7

PROBLEM: ['a', '301']

SOLUTION:
0, 1, 3

