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: ['149', 'o', '237', 't', 'k', 'w']

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

PROBLEM: ['233', '189', '217', 's', '221', 'v', 'c', 'x', '455']

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

PROBLEM: ['g', 'a', '215', 'w', 'c', '217', '295', 'r', 'b']

SOLUTION:
1, 2, 5, 7, 9