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', 'f', 'm', 'w', 'w', 'y', 'b']

SOLUTION: -1

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

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

PROBLEM: ['5', '289', '475', '457', 'n', '33', 'w', '387', 'c', 'h']

SOLUTION:
2, 3, 4, 5, 7, 8, 9