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.

['565', 'i', '615', '3047', 'm', '195', '7547', '3003', '9213', '9063', 'c', '5099', 'v', '5003', '9053']
c, i, m, v

['f', 'p', 'n', '839', '9229', 'r', '7661', 'c', '4383', 'u', 'k', '5321', '3181', '1785', 'w', 'k', '8721', '7855', '4093', '6495', 'q', '2467', 'g']
c, f, g, k, n, p, q, r, u, w

['s', '4235', 's', 'a', 'c', 'o', '6497', 'f', '4317', '5689', '8435', 't', '6803', 'o', '2231', 'h', 'k', '2295', 'i']

a, c, f, h, i, k, o, s, t

