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: ['7823', '2933', 'k', '4139', '5585', 'f', 'c', 'm', '2035', 'q', 'z', 'l', '1999', 'q', 'p', '7291', '2091', 'v', '423', 'e', 's', '6089', '4763', '6739']

Output: c, e, f, k, l, m, p, q, s, v, z


Input: Consider Input: ['7071', 'h', '837', 'z', 'c', '2217', 'c', '6341', '6607', 'g', '3569', 'a', 'h', 't', 'b', 'f', 'g', 'f', 'l', 'b', 'x', 'o', 'r', '8949', '8071', '1507', 'v']

Output: a, b, c, f, g, h, l, o, r, t, v, x, z


Input: Consider Input: ['4675', 'm', '3489', '5669', 'r', 't', 'z', '565', 'd', 'z', 'x', '7819', '6815', '5611', 'e', 'f', '9199', '6293', 'e', 'x', '9405', 'c', '8607', 'i', '9737', '1533', '5857', 'b', 'm', '9559', 'q', 'z', '1279', '1773', 'l', 'p', '5807', 'k']


Output: b, c, d, e, f, i, k, l, m, p, q, r, t, x, z