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: ['87', '353', '329', '163', 'i', 'd', '287']

SOLUTION: 1, 2, 3, 5, 6, 7, 8, 9

PROBLEM: ['t', '103', '349', '203', 'b', 'z', 'i', '337', 'y', '137', '77', 'p', 'k']

SOLUTION: 0, 1, 2, 3, 4, 7, 9

PROBLEM: ['407', 'x', 'a', 'f', 'l']

SOLUTION:
0, 4, 7