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: ['279', 'm', '453', 's', 'x', 'g', 'i', 'x', 'd']

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

PROBLEM: ['t', 'a', '419', '477', '3', 'r', 'p', '421', '43', 'c', '45', 'a']

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