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: ['m', '221', '261', '175', '183', '359', 'h', '157', 'p', 'r', 'c', 'g', '193', 's']

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

PROBLEM: ['r', '171', 'p', '299', 'u', 'n', '421', '331', 'h', '21', 'h', 'x', '435', '327', '373']

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

PROBLEM: ['b', '285', 'v', 'a']

SOLUTION:
2, 5, 8