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: ['85', '311', 'x', '97', 'b', '277', 's', 'a', 'v', 'o', 'a']

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

PROBLEM: ['95', '205', 'c', '101']

SOLUTION: 0, 1, 2, 5, 9

PROBLEM: ['b', 't', 'b', '173', 'b', 'm', 'h']

SOLUTION:
1, 3, 7