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: ['v', '105', 'p', 'w', '295', '239', '453']

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

PROBLEM: ['l', 'm', 'h', '87', '265', 'e', '415', '325', 'p', 'b', '385']

SOLUTION: 1, 2, 3, 4, 5, 6, 7, 8

PROBLEM: ['463', 'n', 'w', 'i', '31', 'c', 's', 'f', 'i', 't', 'o']

SOLUTION:
1, 3, 4, 6