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.

[Q]: ['565', 'i', '615', '3047', 'm', '195', '7547', '3003', '9213', '9063', 'c', '5099', 'v', '5003', '9053']
[A]: c, i, m, v


[Q]: ['747', '5385', '5313', 'p', '9581', 'r', '1339', '3919', 'e', 'e', '8057', '7739', 'i', 'e', '3311', '963', 'g', 'h', '7349', 'y', '1493', 'e', '3055']
[A]: e, g, h, i, p, r, y


[Q]: ['8545', 'f', '4939', '4549', '3173', 'e', '6031', '273', 'g', 'd', 'u', 'j', '5735', 'h', '6193', 'w', 'l', 'z', '9451', 'c', 'g', 'm', '6113', 'e', '5075', '8627', '3829', 'c', '6873', '8035', '641', 'i', '6463', '6719', '1063', 'c', '8565', '7365', 'k', 'm', 'u', 't', '1513', '2423', '7945']
[A]:
c, d, e, f, g, h, i, j, k, l, m, t, u, w, z