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: ['401', 'a', '273', 'c', '117', 'x', 'b', 'h', 's', 'v']

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

PROBLEM: ['x', 'a', '381', 'k', 'n', 'm', '267', 'r', '193', 'f', 'h', 'r', '327', 'i', 'h']

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

PROBLEM: ['g', '171', '13', 'f', 'b', 'y', '61', '165', '253', '417', 'h', 'o', '411', '365', 'k']

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