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: ['397', '287', '401', '97']

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

PROBLEM: ['85', '53', '43', 'j', 'e', '443', '231', 'z', 'f', 'v', '235', '377']

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

PROBLEM: ['125', '27', '35', '63', 'f', '149', '435', '109', '171', '59', 'n', 'a', '455', 'u']

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