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: ['7', 'u', 's', '75', 't', 'o']

SOLUTION: 5, 7

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

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

PROBLEM: ['j', '131', 'e', 'c', '149', '325', 'h', 'l', 'i', 'q', '151']

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