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: ['401', 'a', '273', 'c', '117', 'x', 'b', 'h', 's', 'v']

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

PROBLEM: ['7', 'n', '443', '131', '189', '187', '261', '451', '449', 'o', 'i', 't', '15']

SOLUTION: 1, 2, 3, 4, 5, 6, 7, 8, 9

PROBLEM: ['f', 'c', '381', '149', '67', '67', '197', 'i', '289', '491', 'c', 'b']

SOLUTION:
1, 2, 3, 4, 6, 7, 8, 9