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: ['f', '463', '169', '175']

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

PROBLEM: ['u', 'c', 'f', 'z', '51', '301', 'q', '275']

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

PROBLEM: ['l', '195', 'y', 'k', 'r']

SOLUTION:
1, 5, 9