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', 's', '153', 'e', '377', 'c', 'v', '437']

SOLUTION: 1, 3, 4, 5, 7

PROBLEM: ['279', '115']

SOLUTION: 1, 2, 5, 7, 9

PROBLEM: ['u', '313', 's', 'w', '471', '207', 'u', '35', '217', '391', 'g', '129', 'e', '493']

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