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: ['j', 's', '127', 'o', 'e', '227', 'k', 'o']

SOLUTION: 1, 2, 7

PROBLEM: ['r', 'f', 'l', 'a', 'c', '489', 'e', 'p', 'm', '175', 'l']

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

PROBLEM: ['y', '231', 'l']

SOLUTION:
1, 2, 3