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.

['305', '95', 'e', 'q', 'e', '341', 'u', 'w', '5911', '6851', 's', 'u', '2355', 'd', '4151', 'w', '4421', '1129', '8065', 'k', 'q', '3649']
d, e, k, q, s, u, w

['2313', '2073', 'd', 'e', 'o', '793', '4999', 'f', 'c', '4473', '4519', 'u', 'n', 'k', '69', '475', 'a', 'j', 'q', 'x', '5869', '9523', 'z', 'v', '9265', '5989', 'p', 'm', 'g', 'y', 'b']
a, b, c, d, e, f, g, j, k, m, n, o, p, q, u, v, x, y, z

['2267', 'l', '9799', 'u', 'b', 'm', '909', '9479', '4379', '7185', '7331', '3519', '5785', '7989', '5239', '4433', 'u', 'a', 'r', 'g', '1173', '31', 'l', 'q', 'z', '7095', 'c', '3059', '7615', 'o', '4055', 'i']

a, b, c, g, i, l, m, o, q, r, u, z