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: ['137', '383', 'o', 'z', '199', '329', 'l', 'j', 'p', '469', 'f', 'm', '371', '485']

SOLUTION: 1, 2, 3, 4, 5, 6, 7, 8, 9

PROBLEM: ['73', '215', '389', '381', 'e', 'v', 'j', 'l', 'r']

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

PROBLEM: ['95', '237', '121', 't', '243', 'x', 'b']

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