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: ['43', '479', '317', 'w', '475', '255', '3', 'x']

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

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: ['d', 'w', '83', '371', 'j', '173', 'm', '351', 'b', 's', '297', 'z', 'y']

SOLUTION:
1, 2, 3, 5, 7, 8, 9