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: ['377', 'z', '421', '137', 't', 'v', 's', 'l']

SOLUTION: 1, 2, 3, 4, 7

PROBLEM: ['c', '31', '49', 'x', 'n', 'i', 'a', '135', '65', '401', 'b', '213', 'f', '321']

SOLUTION: 0, 1, 2, 3, 4, 5, 6, 9

PROBLEM: ['f', 'l']

SOLUTION:
-1