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: ['b', '351', 'g', 'k', '29', '15', '411', '97', 'r', '27', '279']

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

PROBLEM: ['j', 'a', '29', 'y', 's', '107', '149', '499', '37', 'o', '289', 't']

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

PROBLEM: ['269', '311', '279', '117', '207', 'u', 'w', '395', 'm', '457', '357', 'j', 'c', 'z', 'x']

SOLUTION:
0, 1, 2, 3, 4, 5, 6, 7, 9