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: ['8859', '575', 'l', 'e', '6575', '1303', '8643', '1395', '3171']

Output: e, l


Input: Consider Input: ['4945', 'i', 'h', 's', '8925', 'i', '3995', 'f', '813', '1823', '3475', 'q', '2463', '9487', 'c', 'c', 'n', 'y', 's', '6269', 'a', 'u', 'd', 'd', '9291', '3187', '545', '7929', 'd', '1007', '7579', '8421', '4033', 'v', 'c', 'e', 'n', 'j']

Output: a, c, d, e, f, h, i, j, n, q, s, u, v, y


Input: Consider Input: ['g', 'n', 'a', '7741', '5925', '3123', '6697', 'c', 'i', '8355', '7537', '1157', 'h', '2695', '9153', '8485', '8657', '7865', 'p', '9873', '8749', 'z', 'l', 'u', 'b', 'v', '1115', 'i', 'k']


Output: a, b, c, g, h, i, k, l, n, p, u, v, z