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: ['411', 'n']

SOLUTION: 1, 4

PROBLEM: ['r', '135', 't', 'm', 'f', '329', '475', '243', 'z', 'q', '31', '141']

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

PROBLEM: ['o', '499', '185', 'k', '419', 'v', 't', 'l', '409', '331']

SOLUTION:
0, 1, 3, 4, 5, 8, 9

