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: ['361', '47', 'k', '33']

SOLUTION: 1, 3, 4, 6, 7

PROBLEM: ['255', 'u', 's', 'g', '445']

SOLUTION: 2, 4, 5

PROBLEM: ['455', 'l', 'i', '345', 'a', '425', '455', 'g', 'j', 'c', '461', 'y', 'a', '273', '237']

SOLUTION:
1, 2, 3, 4, 5, 6, 7