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: ['175', 'c', 'c']

SOLUTION: 1, 5, 7

PROBLEM: ['269', 'f', '321', '175', '15', 'n', 'b', 'z', '53', 'p', 'x', '457', 'q', 'b']

SOLUTION: 1, 2, 3, 4, 5, 6, 7, 9

PROBLEM: ['n', '381', 'j', '131', 'w', '365']

SOLUTION:
1, 3, 5, 6, 8

