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.

['9833', '3383', 'h', '3545', '2899', 'y', 'p', 'q', '1901', '3317', '5641', 'v', 'c', 'u', '5521', 'e', '7997', '2439', '5573', '4119', 'k', '8291', '1009', '8253', '405', '233', 'p']
c, e, h, k, p, q, u, v, y

['1657', 'u', '1849', '425', 'v', '6435', 'j', '2985', '921', '9553', '2621', 'i', '7103', 'd', '8563', 'l', 'b', '6727', '4235', 'n', '8021', 'd', 'z', '437', 'm', '5695', 't', '3421', 'e', 'a', '2941', '791', '1417', '9247', 'h']
a, b, d, e, h, i, j, l, m, n, t, u, v, z

['6391', '9257', 'f', '2609', '4373', '7649', '7265', 'r', '265', '3665', 'w', 's', 't', 'b', 'm', '5533', '2895', '4359', 'v', '7357', 'd', 'p', '8479', 'l', '2341']

b, d, f, l, m, p, r, s, t, v, w