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: ['279', 'm', '453', 's', 'x', 'g', 'i', 'x', 'd']

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

PROBLEM: ['y', 'm', '121', 'h', 'm', '189', '117', '257', 'y', '181', '279', 'a', '453']

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

PROBLEM: ['431', 'l', 'l']

SOLUTION:
1, 3, 4