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: ['285', 'h', '231', 'l', 'd', 'k', '309', '345', 'k', 'p', '351', '93', 'b', 'w']

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

PROBLEM: ['q', 'a', '149']

SOLUTION: 1, 4, 9

PROBLEM: ['251', '33', '149', 'a']

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