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:
['8281', '4831', '1329', 'g', 'e', '8879', 'n', 's', 'x', 'j', '6305', 'j', '921', '3677', '5107', 'n', 'j', '9285', 'a', '5329', '6671', 'c', '9283', 'l', 'a', '7907', 'q', '7605', '855', '6477']

Ex Output:
a, c, e, g, j, l, n, q, s, x


Ex Input:
['5973', 'h', '4081', 'i', '8059', 'w', 'j', '6175', 'w', '8685', '5811', 'k', 'n', '5577', '9817', 'v', '8617', 'u', 'y', '3921', 'b', '1027', '5405', 'a', '3501', '6659', 's', 'e', '157']

Ex Output:
a, b, e, h, i, j, k, n, s, u, v, w, y


Ex Input:
['s', 'y', 'i', '5603', '4511', 'h', '9957', '6161', '4303', '1183', '85', 'p', 'm', '6445', '203', 'v', '4385', '401', '2087', '227', 'y', '6677', '6097', '6767', 'w', 'm', '1227', '8523', '2857', '2913', 'g', 'd']

Ex Output:

d, g, h, i, m, p, s, v, w, y