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: ['o', '235', '479', 'e', '199', 'c', '25', '59', 'g', '415', '201', '129', 'a', 'i', 'c']

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

PROBLEM: ['r', 'u', '83', 'x', '155', '89', 'c', '391', '41', 'o', 'i', '161']

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

PROBLEM: ['i', '457', 'z', 'k', '383', 'l', 'y', 'd', 'i', 't', '59', '363', '415', 'e']

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