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: ['205', '347', '423', 'm', '363', 'u', 'g']

SOLUTION: 0, 2, 3, 4, 5, 6, 7

PROBLEM: ['f', 'c', '381', '149', '67', '67', '197', 'i', '289', '491', 'c', 'b']

SOLUTION: 1, 2, 3, 4, 6, 7, 8, 9

PROBLEM: ['33', '49', '79', 'e', '213', '47', 'l', 'h', '431', 'k']

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