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

SOLUTION: 4, 5, 6, 7, 9

PROBLEM: ['469', '65', '111', '135', '209', 'g', '407', 'd', 'r', '325']

SOLUTION: 0, 1, 2, 3, 4, 5, 6, 7, 9

PROBLEM: ['239', '479', '361', '297', '467', 'u', '409', 'l', '415', '457', '29', '443', '5']

SOLUTION:
0, 1, 2, 3, 4, 5, 6, 7, 9