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: ['u', 'm', 'n', 'h', 'u']

SOLUTION: -1

PROBLEM: ['109', 't', '283', 'c', 'u', 'y', '251', 'x', '377', 'n', 's', 'd', 't', 'q', 'o']

SOLUTION: 0, 1, 2, 3, 5, 7, 8, 9

PROBLEM: ['405', 'g', 'a', 'm', 'd', 'l', '487', 'h', '203', '239', '49', 'q', 'w']

SOLUTION:
0, 2, 3, 4, 5, 7, 8, 9