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: ['v', 'q', '139', '79', '149', '469', 'g', '239', '221', 'v', '77']

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

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

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

PROBLEM: ['e', 'r', 'l', 'q', '337', 'j', 'g', 'd', '443', 'f', 'd', '63', '479', 'z']

SOLUTION:
3, 4, 6, 7, 9