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: ['x', '281', 'n', '385', '435', 'l', 's', '445', 'n', 'n', '133']

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

PROBLEM: ['85', '53', '43', 'j', 'e', '443', '231', 'z', 'f', 'v', '235', '377']

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

PROBLEM: ['m', 'j', 'y', 'x', '125', 'a', 'm', 'w', 'h', '21', '309', 't']

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