Given the task definition and input, reply with output. 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.

['6601', 'k', 'y', '3921', 'i', '9715', '8081', 'm', '9177', '9753', '5085', '3485', '6133', 'c', 'c', 'q', '227', 'c', 'e', '6155', '7769', '8253', 't', '2493', 'r', 'l', 'g', '7409', '4925', 'h', 't', '4165', 'l', '1115', 'u', '4083', '673', 'a', '1575', 'x', 'v', 't', 'i', 'n']

a, c, e, g, h, i, k, l, m, n, q, r, t, u, v, x, y