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.

['5973', 'q', 'd', '553', 'e', '8479', '9825', '399', 'u', '3001', '531', 't', '6711', 'q', '7743', '1657', 'w', '6293', '8951', 'i', 'o', '5041', '6895', 'z', 'k', 't', 'l', 'q', '533', '6425', '2979', '3477', '1727', '223', 'w', 'e', '7427', 'h', 'c', 'g', 'l', '3607', '8957', '5997']

c, d, e, g, h, i, k, l, o, q, t, u, w, z