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: ['473', '357', 'i', 'j', '299', 's', '495', '165', 'o', 'l', 'x', 'v', '1', 'o', '469']

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

PROBLEM: ['j', 'a', '29', 'y', 's', '107', '149', '499', '37', 'o', '289', 't']

SOLUTION: 0, 1, 2, 3, 4, 7, 8, 9

PROBLEM: ['257', '287', 'p', '13', 'd', 'y', '55', 'v', '369', '27', 'u', '397', 'g', 'f', 'r']

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