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: ['85', '311', 'x', '97', 'b', '277', 's', 'a', 'v', 'o', 'a']

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

PROBLEM: ['m', 'c', '139', '433', '29', 'z', '45', 't', 'a', 'n', '297', '45', '281']

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