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: ['y', '8115', 'f', '5333', 'f', '3437', 'b', 'e', '5719', 'm', 'w', '95', '4863', 'k', '4895', 'a', '8179', 'm', '7919', '1731', '229', 'r', '1847', '7559', '6669']

Output: a, b, e, f, k, m, r, w, y


Input: Consider Input: ['c', '8785', 'u', 'i', 'i', '6513', '6093', 'w', 'i', 'x', '9377', 'p', '1545', '7997', 'a', 'c', '125', 'u', '9149', '9103', 'u', 'o', 'h', '2275', '8503', '3251', 'c', '9925', 'w', '6873', 'c', 'h', 'e', '2369', 'c', 'z', '1337', '9541', '675', 's']

Output: a, c, e, h, i, o, p, s, u, w, x, z


Input: Consider Input: ['e', '4601', 'a', '4155', 's', '7293', '9823', 'z', '1011', '6355', 'g', 'v', 'n', 'v', '5071', '6787', '8563', 'd', 'r', 'd', 'z', '8657', '1915', '223', '1451', 'p', '7209', '2003', 'z', '8499', 'a', 'v', '3953', 'p', '4965', '8443', 'r']


Output: a, d, e, g, n, p, r, s, v, z