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: ['b', '351', 'g', 'k', '29', '15', '411', '97', 'r', '27', '279']

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

PROBLEM: ['r', 'o', 'n', '219', 'a', '419', 'x', '261', 'h', 's', '373', '155', 's', '171']

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

PROBLEM: ['325', '397', '161', 'h', '111']

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