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: ['u', '157', '63', '411', 'x', 'c', 'k', 'z', 'i', '279', '311', '431']

SOLUTION: 1, 2, 3, 4, 5, 6, 7, 9

PROBLEM: ['403', 'j', 'x', '187', '311', 'g', 'z', 'p', '287', 'w', 'k', 'm']

SOLUTION: 0, 1, 2, 3, 4, 7, 8

PROBLEM: ['41', 'o', 'u', '431', 'n', 'p', '491', 'f', 'e', '243', '199', 'r', 'l', 'i']

SOLUTION:
1, 2, 3, 4, 9