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:
['l', '7111', 'd', 'e', 'h', 'z', 'x', '5673', 'v', '8255', 'i', 'z', 'c', 'i', '4287', 'q', '9293', '9137', 'p', 'n', 'o', 'n', '7883', '6453', '7355', '8769', 'y', '9153']

Ex Output:
c, d, e, h, i, l, n, o, p, q, v, x, y, z


Ex Input:
['7839', '849', '5651', '4275', 'e', '5453', 'h', '2099', '485', 'i', 'm', 'n', '6563', '5675', '4001', 'h', 'm', 'z', '3467', '4237', '5035', '5609', '8475', '5171', 'v', '3883', '8461', '8611', '4853', 'd']

Ex Output:
d, e, h, i, m, n, v, z


Ex Input:
['n', '6067', 'k', '9773', 'g', 'o', 'u', '2197', '4989', '3403', '1859', 'n', '1289', 't', '5507', 'l', '575', 'm', '5197', 'f', 'v', 'c', '6833', 'f', 'c', '3457', '839', 'v', '8571', 'g', 'r', 'm', '7477', '8383', 'i', 's', 'm', 'w', 'i', 'v', 'i', 'c', 'o', 'z', '4371']

Ex Output:

c, f, g, i, k, l, m, n, o, r, s, t, u, v, w, z