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: ['3035', 'f', 'k', 'e', '3023', 'p', '9667', '5277', '4757', '8433', 'g', '1399', '7721', 'n', 'p', '7469', '7581', '5679', 'g', 'q']

Output: e, f, g, k, n, p, q


Input: Consider Input: ['5345', 'f', '6605', 's', 'q', 'w', 'p', 'o', 's', 'u', 'i', '7339', '8379', 'h', '9547', 'b']

Output: b, f, h, i, o, p, q, s, u, w


Input: Consider Input: ['j', 'z', 'n', 'v', '421', 'x', 'm', '5483', '9883', 'v', 'n', '7859', '5183', '1627', 'c', '7819', 'o', '7269', 'j', '8793', '6421', 'l', 'j', 'h', 'i', '1981', '6213', '4223', '729', 'z', '4307', '9491', 'f', '107', 'w', 'v', 'c', '899', '185', '1477']


Output: c, f, h, i, j, l, m, n, o, v, w, x, z