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.

['5463', '5683', 'w', '4071', '3997', 'i', '9677', 'q', 'l', 'v', 'w', '5325', '197', 'g', 'g', '3227', '3477']
g, i, l, q, v, 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

['6031', 't', 'h', '3905', 'a', '6139', 'g', 'z', 'q', '2933', 'y', 'u', '9441', '3463', 'f', 'k', '63', '9389', '6129', 'z', 'p', 'q', 'j', '8057', '8429', 'p', 'b', '9249', '6357', '8763', '4275', 'r']

a, b, f, g, h, j, k, p, q, r, t, u, y, z