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: ['157', '481', 'n', 't', 'd', 'j']

SOLUTION: 1, 4, 5, 7, 8

PROBLEM: ['z', '143', 'o', '365', 'g', 'h', 'y', 'p', 'j']

SOLUTION: 1, 3, 4, 5, 6

PROBLEM: ['c', 'b', 'n', '407', '345', 'l', '41']

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