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: ['y', 'p', 'q', '2157', 'b', 'w', '8875', 'k', 'i', 'd', '9743', '4941', 'b', 'p', '9941', '495', 'h', 'i', '839', 'c', 'h', 'f', 'b', 'a', 'k', 'z', '7549', '4149', 'h', 'j', '1947', 't', 'f', 'c', '1243']

Output: a, b, c, d, f, h, i, j, k, p, q, t, w, y, z


Input: Consider Input: ['j', '2837', '2787', 'u', '1671', '6729', '7905', 'e', 's', 'c', 't', 'i', 'f', 'm', 's', 'v', 'i', '5497', '3533', 'w', 'a', '813', 'k', 'e', '7289', 't', 's']


Output: a, c, e, f, i, j, k, m, s, t, u, v, w