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.

['2247', 'w', 'h', '4675', '6153', 'f', '6029', 'o', 'd', 'j', 'z', 'y', 'i', '6899', '3917', 'u', '6447', '6405', 'a', '1705', '8585', 'v', 'f', 'r']
a, d, f, h, i, j, o, r, u, v, w, y, z

['s', 'w', '8949', '4025']
s, w

['2827', 'y', 'l', '927', '7561', 'l', '3467', 'y', 'g', '6827', 'e', 'w', 'o', '4029', 'e', 'i', 't', '1339', '2793', '2313', 'z', 'r', 'r', 'q']

e, g, i, l, o, q, r, t, w, y, z