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:
['2633', 'd', 'r', '8083', 'f', 'd', '5121', '8651', 'o', 'b', '811', '7551', 'x', 'p', 'm', 'v', 'm', '7833', '1959', 'y', 'p', '779', '1889']

Ex Output:
b, d, f, m, o, p, r, v, x, y

Ex Input:
['3117', 'i', 'd', '7537', 'i', 'q', '4649', '7263', '3655', 'd', 'x', '8569', 'g', '2389', '3933', '7099', '563', '3055', '9941', 'm', 'c', '3529', '3577', 'x', 's', 's', '6153', '1731', '9679', 'f', '8839', '5183', '5', '6433']

Ex Output:
c, d, f, g, i, m, q, s, x

Ex Input:
['5139', '4145', '6059', '8001', '7793', 'a', 'n', '287', 'm', 'v', '8871', 't', 'b', '6183', 'u', 'e', 'b', '8955', '4757', 'b', 'p', '6399', 'c', '2975', '2881', 'g', '8283', 'f', '7361', 'w', 'p', '7627', 'x', '7329', '9807', '2829', 'r', 'f', '2379', '369', 'm', '8885', 'i', 'm']

Ex Output:
a, b, c, e, f, g, i, m, n, p, r, t, u, v, w, x