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

SOLUTION: 1, 2, 3, 4, 7

PROBLEM: ['395', 'p', '373']

SOLUTION: 3, 5, 7, 9

PROBLEM: ['w', '289', 'z', '429', '475']

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