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:
['2505', '4199', 'e', '5433', '8795', 'q', 'i', '9357', 'o', '257', '8235', 'b', '1339', 'w', '1463', 'm', '277', '3211', '3863', 'r', 'm', 'i', '5793', '7451', '4787', '4739', 'k', 't', 'o', '7453', '9385', 'v', 'l', 'y', 'f', 'r', 'p', 'w']

Ex Output:
b, e, f, i, k, l, m, o, p, q, r, t, v, w, y


Ex Input:
['h', 'u', 'y', '7677', '9441', '1769', 'v', '1433', 'l', '7739', 'a', '8305', 'n', 'a', '6711', '3161', 'e', 'u', '993', '2211', '4011', 'q', 'o']

Ex Output:
a, e, h, l, n, o, q, u, v, y


Ex Input:
['v', '8659', '2541', 'a', 'f', '2165', '8205', '4569', 'x', '6839', '1117', 'k', '2607', '6291', '3375', '8555', 'c', '3349', '9711', 'n', '4391', 'x', 'z', '2119', '9167', 'm', 'v', '6143', '3497', '8485', '3259', '4835', '817', 'g', '4475', '8013', 'i', 'r', '7351', 'n', 't', 'p', 'g', 'h', '1761']

Ex Output:

a, c, f, g, h, i, k, m, n, p, r, t, v, x, z