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: ['411', '367']

SOLUTION: 1, 3, 4, 6, 7

PROBLEM: ['469', 'y', 'j', 'u', '475', 'k', 'k']

SOLUTION: 4, 5, 6, 7, 9

PROBLEM: ['461', '443', 'h']

SOLUTION:
1, 3, 4, 6