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', '153', '13']

SOLUTION: 1, 3, 5

PROBLEM: ['339', '473', '485']

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

PROBLEM: ['d', 'a', '417', 'v', 'o', 'i', '237', 'g']

SOLUTION:
1, 2, 3, 4, 7