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:
['g', '8591', '4463', '2189', '7901', '1457', 'f', 'i', '9031', 'r', '5519', '3955', 'd', '2093', 'c', 'y', '6591', '6463', 'h', '4371', '111', 'p', '3221', '4185', 'p', '8761', 'w', 'p']

Ex Output:
c, d, f, g, h, i, p, r, w, y


Ex Input:
['j', 's', 'z', 'v', '5401', 'u', '8859', 'i', 'l', 'a', 'p', 'v', 'v', 'o', '3969', '4091', 'y', '6827', '1799', '5163', 'd', 'w', '4795', '5167', 'x', 'q', '2903', '1171', '5279', '449', '7901', 'u']

Ex Output:
a, d, i, j, l, o, p, q, s, u, v, w, x, y, z


Ex Input:
['f', '977', '7119', '1477', '5981', '2723', '8479', '6639', 'f', '4669', '9149', 'g', 'g', '8757', 't', 'k', '1419', '9501', 'v', '1865']

Ex Output:

f, g, k, t, v