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: ['c', 'a', 'p', 'p', '4203', '1587', '2953', '9809', '99', '5821', 't', 'i', '4213', '1809', 's', 'l', 'i', 'b', '9233', '3983', '7713', '1807', 'k', 'f', '7825', '5491', 'o', '1347', 'u', 'h', '3967', 'u', 'g', '6775', '1069', '9211', 'i', '3369', 'r']

Output: a, b, c, f, g, h, i, k, l, o, p, r, s, t, u


Input: Consider Input: ['8311', 'w', 'f', '3431', '9863', '5817', '3969', '2705', 'x', 'm', 'k', 'z', 'z', '235', 'x', '417', 's', 'i', 'y', '8833', '8675', 's', 'm', '2149', '765', 'u', '1021', '7823', 'x', '7275', '3157', 'k']

Output: f, i, k, m, s, u, w, x, y, z


Input: Consider Input: ['2155', 'm', '1417', 'w', '9359', '7941', '9159', '8227', '2651', 'g', '8973', 'l', '4617', 'c', '2373', '5885', '6809', '863', '1877', 'h', 'o', 'g', '9459', 'o', '6801', 'k', 'b', 'y', '4293', '1219', '4003', '9149', 'z', 'o', '3395', '3763', 'w', 'q', '9559', '697', '9433']


Output: b, c, g, h, k, l, m, o, q, w, y, z