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: ['t', 'r', 'z']

SOLUTION: -1

PROBLEM: ['v', 'q', '139', '79', '149', '469', 'g', '239', '221', 'v', '77']

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

PROBLEM: ['125', '345', 'e', 'e', '85', '435', '93']

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