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: ['i', 'f', '109']

SOLUTION: 0, 1, 9

PROBLEM: ['91', '291', '379', 'k', 'a', 't', 'i', '355', 'l', '335', '119', '343']

SOLUTION: 1, 2, 3, 4, 5, 7, 9

PROBLEM: ['x', 'q', '7']

SOLUTION:
7