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: ['261', '227', 'f', 'w', '141', 'k', '119', '407', '409', '373']

SOLUTION: 0, 1, 2, 3, 4, 6, 7, 9

PROBLEM: ['f', '367', 'w', '227', '201', 'n', '213', '11']

SOLUTION: 0, 1, 2, 3, 6, 7

PROBLEM: ['v', '467', 'm', '23', '479', '49', 'k', 'u', 'l', '119']

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