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: ['y', '8115', 'f', '5333', 'f', '3437', 'b', 'e', '5719', 'm', 'w', '95', '4863', 'k', '4895', 'a', '8179', 'm', '7919', '1731', '229', 'r', '1847', '7559', '6669']

Output: a, b, e, f, k, m, r, w, y


Input: Consider Input: ['i', '1191', '5581', '2527', 'g', '9795', '519', 'u', '8389', '9793', 'k', '5733', '7125', '7835', 'j', '855', 'd', 'd', '6555', '3211', 'l', 'o', 'b', '523', 'x', 'j', '1707', '4161', '7171', 'h', 'h', 'm', 'h', '2443', 'e', '649', '951', 'n', 'h']

Output: b, d, e, g, h, i, j, k, l, m, n, o, u, x


Input: Consider Input: ['387', 'd', '3807', 'z', 'o', 'g', 'x', '7715', '5095', 'k', '9253', '2707', 'f', '8739', '7047', 'j', '8701', '9863', 'l', '4389', 'w', '2733', '2455', '6741', '9683', 'p', '257', 'u', 'n', '581', 'o', 'z', 'j', '185', '9479']


Output: d, f, g, j, k, l, n, o, p, u, w, x, z