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: ['475', 's', '123', '389', 'y', 'm', 'v', '47', 'u', '479', '357', '279', '137', 'l', 'i']

SOLUTION: 1, 2, 3, 4, 5, 7, 8, 9

PROBLEM: ['197', 'p', 'e', '217', '327', '439', '59', 'o', '355', 'z']

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

PROBLEM: ['v', '441', '409', '123', 'w', 'f', 'c', 'm', 'a', '409', 'w', 'n', 'b', '305', 'a']

SOLUTION:
0, 1, 2, 3, 4, 5, 9