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: ['353', 'y', 'a', 'g', '141', '97', '457', '297', '25', 'g', '131', 'u', '303', '39', 'p']

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

PROBLEM: ['j', '463', 'z', '35', 'w', '191', '333', 'a']

SOLUTION: 1, 3, 4, 5, 6, 9

PROBLEM: ['43', '33', 'p', '21', '313', '375', 'z', '193', '13']

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