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

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

PROBLEM: ['p', '103', 'd', '411', 'f']

SOLUTION: 0, 1, 3, 4

PROBLEM: ['305', 'f', 'p', '187', '5']

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