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: ['z', 'b', 'c', 'l', '453', 'h', '215', '447', '487', 'p', 'y', 'v']

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

PROBLEM: ['7', 'n', '443', '131', '189', '187', '261', '451', '449', 'o', 'i', 't', '15']

SOLUTION: 1, 2, 3, 4, 5, 6, 7, 8, 9

PROBLEM: ['r', 'a', 't', '215', 'n', 's', '289', 'y', 'p', 'd', 'u', 'w', 'v', '125', 'm']

SOLUTION:
1, 2, 5, 8, 9