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: ['n', '149', 'z', '37']

SOLUTION: 1, 3, 4, 7, 9

PROBLEM: ['265', 'x', '109', '319', 's', 'w', '211']

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