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

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

PROBLEM: ['z', 'g', '311', 'd', 's', 'w']

SOLUTION: 1, 3

PROBLEM: ['d', '83', '145', 'f', '83']

SOLUTION:
1, 3, 4, 5, 8