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: ['499', '493', 'i', '87']

SOLUTION: 3, 4, 7, 8, 9

PROBLEM: ['7', 'u', 's', '75', 't', 'o']

SOLUTION: 5, 7

PROBLEM: ['g', '341', '165', 'v', '283', '1', 'a']

SOLUTION:
1, 2, 3, 4, 5, 6, 8