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: ['t', '251', 'b', '241', 'z', '255']

SOLUTION: 1, 2, 4, 5

PROBLEM: ['289', 'f', 'y', 'n', '271', '223', 'v', 'p', 'v', 'w', '7', 'i', '195']

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

PROBLEM: ['251', 's', 'k', 's']

SOLUTION:
1, 2, 5