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: ['t', '175', '163', 'k', '279', '385', 'y', '71', 'g']

SOLUTION: 1, 2, 3, 5, 6, 7, 8, 9

PROBLEM: ['t', '251', 'b', '241', 'z', '255']

SOLUTION: 1, 2, 4, 5

PROBLEM: ['331', '429', '325', '183', 'c', '303', '283', 'b', '459', 'u', '357']

SOLUTION:
0, 1, 2, 3, 4, 5, 7, 8, 9