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', 'l', 'g', 'w', '13', 'd', '123', '279', '293', 'n', '341', 'n', '359', '35', 'd']

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

PROBLEM: ['121', 'm', 'n', '143', '281', 'c', 'j']

SOLUTION: 1, 2, 3, 4, 8

PROBLEM: ['y', 'u', 'm', 'p', 'c', '401']

SOLUTION:
0, 1, 4