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: ['o', '235', '479', 'e', '199', 'c', '25', '59', 'g', '415', '201', '129', 'a', 'i', 'c']

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

PROBLEM: ['9', '129', '467', '59', 'm', 'n', 'd', '107']

SOLUTION: 0, 1, 2, 4, 5, 6, 7, 9

PROBLEM: ['489', '213', '243', 't', 'a', '269', '435', 'm', '171', '367', '173', 'r', '183', '215', '245']

SOLUTION:
1, 2, 3, 4, 5, 6, 7, 8, 9