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: ['s', '443', '239', 't', '99']

SOLUTION: 2, 3, 4, 9

PROBLEM: ['233', '339', '319']

SOLUTION: 1, 2, 3, 9

PROBLEM: ['e', '205', 'b', '415', 'c', 'e', '435', '271', 'y', 'o', '11', 'u', 'd']

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