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: ['s', '391', 'z', '67', '371', '195', '77', '373', 'g', '249', 'm']

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

PROBLEM: ['405', 'x', '163', 'z', 'z', '261', 'o']

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

PROBLEM: ['o', '121', '277', '121', 'n', 'b', '231', '473']

SOLUTION:
1, 2, 3, 4, 7