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.

Example Input: ['v', '2989', 'z', '7843', 'e', '9923', 'y', 'b', '7611', 'u', 'u', '6227', '3145', 'w', '6451', 'g', '3129', 'o', 'r', 'z', '8349', 'u', 'h', 'd', 'g', 'a']
Example Output: a, b, d, e, g, h, o, r, u, v, w, y, z

Example Input: ['8815', 'w', '8629', 'y', '3891']
Example Output: w, y

Example Input: ['a', 'q', '1309', 'q', '5841', '7141', '5465', '3589', 'z', '529', '7641', 'u', '3369', 'n', '495', '1169', 'p', 'g', '7427', '1969', 'g', '3723', '5155', '53', '5093', '6857', '4881', 'f', '7811', 'e', '7139', '1027', '9367', 'q', 'i', '6693', 'w', '4449', '453']
Example Output:
a, e, f, g, i, n, p, q, u, w, z