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:
['o', 'h', 'z', 'n', 'e', 'y', 't', '4371', 'm', '1059', '4853', '8529', 'l']

Ex Output:
e, h, l, m, n, o, t, y, z


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

Ex Output:
d, e, k, q, s, u, w


Ex Input:
['q', '269', '7847', 'c', '1165', '4683', '9635', 'b', '7151', '7789', 'g', '1939', '7679', '5689', 'i', 'e', '8717', 't', 'p', '5305', 'h', 'q', '3849', 'c', 'v', 'e', 'x', 'c', '2807', '6037', 'f', '2307', 'y', '2479', 'h', 'f']

Ex Output:

b, c, e, f, g, h, i, p, q, t, v, x, y