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: ['101', '473', '25', 'i', '117']

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

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: ['y', '289', '77', '25', '309', '491', '313', '17', 'w', '293']

SOLUTION:
0, 1, 2, 3, 4, 5, 7, 8, 9