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: ['363', 'u', '179', 'e', '279', 'a', '151', '173', 'e', '61', '213']

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

PROBLEM: ['k', 'k', 'o', 'c', 'p', '301', 'o']

SOLUTION: 0, 1, 3

PROBLEM: ['21', 'a', 'p', 'f', 'r', 'm', 'p', 'c', '405', '19']

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