TASK DEFINITION: In this task, you are given an input list A comprising of numbers and alphabets. You need to extract and sort the unique alphabets in the list. The alphabets in the input list will only be in lowercase. Return -1 if there is no alphabet in the input list.
PROBLEM: ['653', '1969', '6235', '6283', 'd', 'e', '465', 'e']

SOLUTION: d, e

PROBLEM: ['y', 'i', '257', '3695', 's', '6717', '4817', '4117']

SOLUTION: i, s, y

PROBLEM: ['f', '8219', 'h', '6981', 'd', '6431', 'x', 'h', 'i', '5367', '3359', '6007', '6151', 'e', '5357', 'c', 'h', '8225', 'f', 'u', 'o', 'c', 'u', 'h', 'g', 'p']

SOLUTION:
c, d, e, f, g, h, i, o, p, u, x