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: ['173', 'r', 'a', 'n', 'h', 'o', 'w', '135', '321', '59', 'r', '295', 'r']

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

PROBLEM: ['m', 'c', '139', '433', '29', 'z', '45', 't', 'a', 'n', '297', '45', '281']

SOLUTION: 1, 2, 3, 4, 5, 7, 8, 9

PROBLEM: ['x', '285', '195', '31', '389', 'm', 's', '357', '165']

SOLUTION:
1, 2, 3, 5, 6, 7, 8, 9