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:
['q', '6421', 'w', 'x', '669', 'h', '3853', '6609', 'p', '947', 'g', 'c', 'x', '2617', 'v', 'e', '4795', '5755', 'a', '2379', 'y', '5939', 'l', 'h', 'g', '3779', 'c', 'm', '3157', '4027', 'g', '2917', '9461', '7271', 't', 'i', '9807', '147']

Ex Output:
a, c, e, g, h, i, l, m, p, q, t, v, w, x, y


Ex Input:
['e', 'k', '7569', '6387', '4593', '2445', '345', '2905', 'h', '3119', '7001', 'x', 'a', '2943', '3635', 'l', 'q', 'z', 'g', '2657', '7849', 'i', '9413', 'm', 'e', '2951', 'd', '2963', 'b', 'u', 't', 'i', '1141', 'c', 'm', '8607', 's']

Ex Output:
a, b, c, d, e, g, h, i, k, l, m, q, s, t, u, x, z


Ex Input:
['j', 'j', 'a', '1233', '9831', '809', '7781', 'w', 'g', '5235', '3449', 'f', '1939', '6383', 'k', '9591', 'p', '6457', 'g', 'x', 'b', '4125', 'n', 's', '7237', '9527', 'u', '7139', 'j', '8057', '8561', '8963', 's', '265', '5441', 'h', 'z', 'o']

Ex Output:

a, b, f, g, h, j, k, n, o, p, s, u, w, x, z