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: ['13', 'p', '427', 's', 'x', 'x', '43', 'h', 'j', 'z', '21']

SOLUTION: 1, 2, 3, 4, 7

PROBLEM: ['v', 'g', '37', '11', 'x', '389']

SOLUTION:
1, 3, 7, 8, 9