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: ['169', '159', '103', '245', '449', 'a', 'w', 'b', '131', '385']

SOLUTION: 0, 1, 2, 3, 4, 5, 6, 8, 9

PROBLEM: ['x', '493', 'x', '211', 'n', '143', '277', '191']

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

PROBLEM: ['u', '261', 'd', '171', 'a']

SOLUTION:
1, 2, 6, 7