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: ['2741', '2541', '8943', 'l', '4047', '2211', 'p', 'e', 't', '7645', '9771', 'f', '5063', '2303', '6097', '5089', 'd', 'e', '1409', '3125', '2171', 'g', '1247', '4045', 'v', 'h', 'u', '2587', '5207', '5553', 'g', 'd', '6891', 'e', '2471', '2435']

Output: d, e, f, g, h, l, p, t, u, v


Input: Consider Input: ['3191', '2655', '239', '2585', '3369', '7815', '5919', '8269', '5633', 'x', '8085', '2909', 'y', '2465', 'i', '1579', 'u', '2371', 'l', '1949', '51', 'e']

Output: e, i, l, u, x, y


Input: Consider Input: ['o', 'l', '9113', '7997', '233', '857', '7433', '5797', 'u', '9189', '4559', '9711', '9735', '3739', '6495', '8963', '9635', 'p', 'w', '1697', 'm', 'g', 'b', '4963', '4407', 'd', 'y', '2173', '663', 'k', 'w', '1845', '5737']


Output: b, d, g, k, l, m, o, p, u, w, y