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.

Ex Input:
['o', 'v', 'w', '7939', '571', '395', '3707', 'm', 'd', 'u', 'o', 'r', '4211', '9645', '8731', '2441', 'y', '8147', '8809', 'e', 'b', '6835', 'i', '2083', 't', '3481', 'f', 'f', '5559', '3601', 'e', '5637', '5185', 't', '6777', '3419', '8637', 'p', 's', 'o', 'x']

Ex Output:
b, d, e, f, i, m, o, p, r, s, t, u, v, w, x, y


Ex Input:
['z', '2519', '4799', '4715', '7165', 'r', 'r', 'l', 'n', '6925', '8935', '9795', '5489', 'v', 'u', '6527', '2241', 'u', 'c', 'w', '9755', 'w', '9823', 'g']

Ex Output:
c, g, l, n, r, u, v, w, z


Ex Input:
['t', 'c', 'w', '5183', '6451', '9165', '4357', 'g', 'n', '5765', '3539', 't', '6727', 'q', 's', 'd', '3617', '5321', '8959', 'g', '415', 's', 'k', '6539', '6189', 's', 'u', '675', 'u', 'x', 'f', 'u', '9907', '305', 'h', 'p', 'y', 'g', 'd', 's', 'm', 'x', 'y', 'l', 'k']

Ex Output:

c, d, f, g, h, k, l, m, n, p, q, s, t, u, w, x, y