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: ['k', '107', '333', '317', 'm', 'w', 'g', 'f']

SOLUTION: 0, 1, 3, 7

PROBLEM: ['k', '217']

SOLUTION: 1, 2, 7

PROBLEM: ['d', 'w', '215', '321', '53', 't', '113', '343', 'w', '411', '303', '343', '177']

SOLUTION:
0, 1, 2, 3, 4, 5, 7