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

['w', 'a', 'm', 'd', '409', 'm', 'v', 's', '7801', 'l', '8551', 'k', '867', 'n', '7731', 'z', '3773', '9137', 'v', 's', 'p', 'p', 'f', 'z', 'g', 'q', 'g', '877', '697', '2057', '8389', '2399', '5263', '2761', '9841', '1781', 'l', '8023']
a, d, f, g, k, l, m, n, p, q, s, v, w, z

['6401', 'o', 'l', 'b', 'j', 'f', 'h', '9459', '2171', 'k', '8339', 'q', 'c', '935', '7401', '4057', '5143', 'o', '9919', 'f', '7875', 'd', '6345', '2675', '3673', 'w', 'p', '2301', '3779', '1457', '3527', '8653', '7969', '5019', 'n', 'i', 'p', 'w', '643', 'l', '1001', '8861', '9657', '9995', 'e']

b, c, d, e, f, h, i, j, k, l, n, o, p, q, w