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', 'n', '369', '199', 'r', '165', '63', 'y', '331', '57']

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

PROBLEM: ['i', 'f', 'g', '267', '113', '93', 'r', '401', 'g', 'e']

SOLUTION: 0, 1, 2, 3, 4, 6, 7, 9

PROBLEM: ['k', '319']

SOLUTION:
1, 3, 9