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: ['t', '175', '163', 'k', '279', '385', 'y', '71', 'g']

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

PROBLEM: ['159', 's', 'z', '85', 't', 'g']

SOLUTION: 1, 5, 8, 9

PROBLEM: ['n', 'q', '397', '387', 'l', 'p']

SOLUTION:
3, 7, 8, 9