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: ['x', 'u', 'm', '8089', '9985', 'e', '2927', 'n', '7085', 'q', 'v', 'f', 'p', '5079', '3339', '7871', 'h', '7389', '733', 'e', '3387', 'b', 'x', 'z', '2039', 'u', '59', '5031', '8115', '5447', '3045', 'x', '6591', '9561', '4315']

Output: b, e, f, h, m, n, p, q, u, v, x, z


Input: Consider Input: ['z', '2519', '4799', '4715', '7165', 'r', 'r', 'l', 'n', '6925', '8935', '9795', '5489', 'v', 'u', '6527', '2241', 'u', 'c', 'w', '9755', 'w', '9823', 'g']

Output: c, g, l, n, r, u, v, w, z


Input: Consider Input: ['4763', 'i', 'u', 'd', 'm', '3605', 'a', '3925', '7141', '1723', '6847', '2119', 'z', 'x', '1841', '981', 'q', '4499', 'i', '8193', 'e', '4451', 'k', 'd', '7967', 'u', '4275', '9877', 'e', 'm', 's', 'g', '9359', 'j', '4971', 'x', '4037', 'w', 'i', 'i', '9735', 's', 'k', 'h', '6039']


Output: a, d, e, g, h, i, j, k, m, q, s, u, w, x, z