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: ['489', 'y', 's', 'x', '203', 't', 'y', '461', 'v', 'k', '371', 'e']

SOLUTION: 0, 1, 2, 3, 4, 6, 7, 8, 9

PROBLEM: ['385', 'k', 'a', 't', 'o', 'b', 'g', 'u', '319', 'e', '315', '365']

SOLUTION: 1, 3, 5, 6, 8, 9

PROBLEM: ['415', '421', '349', '267', 'o', '493', 'p', 'd', 'i', '277', '445', '415']

SOLUTION:
1, 2, 3, 4, 5, 6, 7, 9