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', '419', 'u', 'h', 'k', 'w', 'a', '289', 'd', 'v', 'u', '117', '327', '85', '441']

SOLUTION: 1, 2, 3, 4, 5, 7, 8, 9

PROBLEM: ['t', '211', 'h', '99']

SOLUTION: 1, 2, 9

PROBLEM: ['n', '279']

SOLUTION:
2, 7, 9