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: ['c', '471', 'l', 'z', '23', 'c', '43', 'o', '175', 'w', 'c', 'p', '431']

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

PROBLEM: ['z', 'v', 't', 'm', '51', 'e', 'l', 'l', '83', '301', '21', '347', 'm', '41', 'b']

SOLUTION: 0, 1, 2, 3, 4, 5, 7, 8

PROBLEM: ['259', '39', 't', '361', '375', 'x', 'o', 'm', 'e', 'j', '319', 'u', '365', '177', '161']

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