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: ['e', 'o', 'c', 'j', 'g', '249', 's', 'b', 'f', '359', '107', 'i']

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

PROBLEM: ['h', 'e', 'v']

SOLUTION: -1

PROBLEM: ['a', 'j', 'e', '51', 'h', 'g', 'r']

SOLUTION:
1, 5