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: ['c', '435', 'c', 'q', 'u', '191', 'b', 'l', '217']

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

PROBLEM: ['r', 'o', 'n', '219', 'a', '419', 'x', '261', 'h', 's', '373', '155', 's', '171']

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

PROBLEM: ['v', 't', 'w', 'a', 'v', '211', '415', 'z', 'c', '367', 'q', 'j', 'j', 'h', 'a']

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