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: ['291', 'p', '261', 'z', '21', 'w', 't', '417']

SOLUTION: 1, 2, 4, 6, 7, 9

PROBLEM: ['159', '3', 'f', 'k', 'o', 'm']

SOLUTION: 1, 3, 5, 9

PROBLEM: ['l', '109', 'd', 'e', '171', 'i', '215', 't', '483', 'r', '61', 'v', 'n', 'h', 'u']

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