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: ['l', 'g', 'o', 'x', '27', 'r', '123', '395', 'p', '27', '213', '455', 'y', '97']

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

PROBLEM: ['415', '365', '373', 't', 'n']

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

PROBLEM: ['131', '31', '65', '153', 'o', 'k', 'z', 's', '281']

SOLUTION:
1, 2, 3, 5, 6, 8