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: ['u', 'w', '401', 't', 'g', 'h', 'g', '8073', '9597', '1347', '7835', '5007', '977', 'p', '7679', 'b', '4883', '4931', '999', 'r', '1181', 'x', '2063', 'l', 'w', 'i', 'l', 'x', 'i', '9057', '5007', 'w', '743', '1635', 'y', 'f', '9227', 'z', '5227', 'd', '7129', 'k', '7657']

Output: b, d, f, g, h, i, k, l, p, r, t, u, w, x, y, z


Input: Consider Input: ['c', 'h', '8655', 'r', '7531', 's', 'r', 'w', 'e', 's', 'p', '1709', '5447', 'b', '5855', 'w', 'f', 'i', '7809', 'q', '1975', 'z', '4037', 'k', 'l', 'z', 'g', '9739', '8801', '3405', '6549', '4561', 'd', '1669']

Output: b, c, d, e, f, g, h, i, k, l, p, q, r, s, w, z


Input: Consider Input: ['6471', '5347', '3403', '7361', 'i', '2619', 'u', 'j', 'o', 'h', '1529', '8131', 'b', 'n', '8499', 'a', 'h']


Output: a, b, h, i, j, n, o, u