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: ['g', 'j', '239', 'w', 'q', 'm', 'a', 'l', 'n', 'p', 'i', 'r']

SOLUTION: 2, 3, 9

PROBLEM: ['401', 'a', '273', 'c', '117', 'x', 'b', 'h', 's', 'v']

SOLUTION: 0, 1, 2, 3, 4, 7

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

SOLUTION:
0, 1, 9