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.

Input: Consider Input: ['1345', 'y', '7221', 'h', 'r', '3255', 'k', 'r', 'j', '8639', '467', 'f', 'k', 'n', 'k', 'j', 'l', 'w', '143', 'w', 'q', '5657', '589']

Output: f, h, j, k, l, n, q, r, w, y


Input: Consider Input: ['749', 'r', 'a', 's', 't', '5905', 'm', 'd', '8437', '4583']

Output: a, d, m, r, s, t


Input: Consider Input: ['n', '8427']


Output: n