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: ['3411', 'a', 'v', 'j', '8925', '909', 'h', 'l', 'r', '1371', 'u', '7789', '4813', 'u', 'q', 'i', '8473', 'n', '7191', 'c', '4641', 'e', '5107', 'q', 'z', 't', '105', 'q']

Output: a, c, e, h, i, j, l, n, q, r, t, u, v, z


Input: Consider Input: ['c', '8389', 'j', '6113', '5843', 'f']

Output: c, f, j


Input: Consider Input: ['1383', 'f', '9277', 's', '3441', '85', 'o', 'x', '8787', '3911', '1139', 'm', 'e', 'n', '975', '1785']


Output: e, f, m, n, o, s, x