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: ['479', '205', 'e', 'c', '57', 'm', 'i', '33', 'f', '45', 'z']

SOLUTION: 0, 2, 3, 4, 5, 7, 9

PROBLEM: ['97', '147', 'j', 'm', 'c', '445']

SOLUTION: 1, 4, 5, 7, 9

PROBLEM: ['431', 'o', 'v', 'm', '41', '187']

SOLUTION:
1, 3, 4, 7, 8