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: ['e', 'o', 'c', 'j', 'g', '249', 's', 'b', 'f', '359', '107', 'i']

SOLUTION: 0, 1, 2, 3, 4, 5, 7, 9

PROBLEM: ['v', '105', 'p', 'w', '295', '239', '453']

SOLUTION: 0, 1, 2, 3, 4, 5, 9

PROBLEM: ['465', '141', '87', '389', '175', 'n', 'p']

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