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: ['61', '255', 'u', '219', '197', 'i', '453', 'i', '267', '217', 'o', 'g']

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

PROBLEM: ['m', '347', 'o', 'i', 'u', '135', 'e', '179', 'q', '13']

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

PROBLEM: ['x', '337', 'n', '337', '323']

SOLUTION:
2, 3, 7