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: ['483', '409', '129', 'u', '167', '275', 'p', '163', 'r', 'q', 'i', '481', 'j', '271']

SOLUTION: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9

PROBLEM: ['159', 's', 'z', '85', 't', 'g']

SOLUTION: 1, 5, 8, 9

PROBLEM: ['291', '157']

SOLUTION:
1, 2, 5, 7, 9

