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: ['t', 'p', 'u', 'a']

SOLUTION: -1

PROBLEM: ['v', 'w', 'k']

SOLUTION: -1

PROBLEM: ['l', 'f', 'u', 'e', 'e', 'o', 'm', '381', 'a', 'b']

SOLUTION:
1, 3, 8