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.

Ex Input:
['4945', 'i', 'h', 's', '8925', 'i', '3995', 'f', '813', '1823', '3475', 'q', '2463', '9487', 'c', 'c', 'n', 'y', 's', '6269', 'a', 'u', 'd', 'd', '9291', '3187', '545', '7929', 'd', '1007', '7579', '8421', '4033', 'v', 'c', 'e', 'n', 'j']

Ex Output:
a, c, d, e, f, h, i, j, n, q, s, u, v, y


Ex Input:
['e', 'z', '5199', 'x']

Ex Output:
e, x, z


Ex Input:
['6111', 'j', 't', '5753', '6551', 'd', '8779', 'u', 'u', 'k', 'n', 'r', '6725', '1305', '4387', '5819', 'n', 'b', 'l', 'o', 'g', 'e', 'v', 'y', 'j', '4729', 'q', '6095', 'q', '2375', '8949', 'v', '341', 'm', '8355', 't', 'l', '8697']

Ex Output:

b, d, e, g, j, k, l, m, n, o, q, r, t, u, v, y