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: ['2381', 'y', '6631', '5839', 'r', 'm', 'z', 'b', '4663', '595', '7771', '5305', '5087', '3317', '3125', '9551', '4343', '5121', 'm', 'i', '131', '8401', '5379', '1775', 'u', '1125', '9793', '4123', 'h', '1613']

Output: b, h, i, m, r, u, y, z


Input: Consider Input: ['w', '1081', 'n', '2073', 't', '6351', '5591', 'a', '113', 'w', 'q']

Output: a, n, q, t, w


Input: Consider Input: ['b', 'c', '7413', 'q', 'a', '7277', '4539', 'a', '6365', 'l', '7293', '5435', 'k', '9909', 'b', 'i', 'u', '5831', 'i', 'd', '7205', '5331', '3229', '3987', '8975', 'n', '5057', 'i', 'j', '7481', 'b', 'z', '3629', '8899', 't', 'q', 'f', 'c']


Output: a, b, c, d, f, i, j, k, l, n, q, t, u, z