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: ['z', '273', '447', 'h']

SOLUTION: 2, 3, 4, 7

PROBLEM: ['i', '127', 'j', 'z', '489', '359', 'i', 'j', 'y', 'p', 'm', 'z']

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

PROBLEM: ['133', 's', 'o', '209', 't', '257', '443', 'n', '1', '137', '197', '415', 'b', 'g', 'k']

SOLUTION:
0, 1, 2, 3, 4, 5, 7, 9