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.

['485', 'l', '3293', '2687', 'd', 'q', '3997', 'h', '7593', '2859', 't', '8787', 'i', 'n', '8787', '4569', '7945', 't', 'k', '8463', '6665', 'g', '9011', 'q', '8347', '7371', '8145', 'i', '2597', 'j', '8799', '2849', '3091', '8727', '9755', '5367', 't', '2775', 'k', 'x', '6567', '1593', 'o', '9055', 'i']
d, g, h, i, j, k, l, n, o, q, t, x