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: ['f', '73', 'k', '333', '345', 'e', 'x', 'j']

SOLUTION: 3, 4, 5, 7

PROBLEM: ['x', '281', 'n', '385', '435', 'l', 's', '445', 'n', 'n', '133']

SOLUTION: 1, 2, 3, 4, 5, 8

PROBLEM: ['489', '27', '375', '471']

SOLUTION:
1, 2, 3, 4, 5, 7, 8, 9