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:
['i', 's', 'f', 'i', '2293', '245', '4983', 'h', 'h', '6203', '8703', '1613', 'h', 'o', '3635', '8069', '2829', '1939', 'u', 'm', '5305', 'n', 'k', '9367', 'u']

Ex Output:
f, h, i, k, m, n, o, s, u


Ex Input:
['g', 'u', 'q', '1375', '9491', 't', 'w', 'c', 'v', 'y', '3169', '1607']

Ex Output:
c, g, q, t, u, v, w, y


Ex Input:
['n', '7135', '633', 'q', '3145', 'v', '1959', 'l', '9161', 'p', '1699', '9195', '1785', '8381', 'n', 'p', '9029', '361', 'w', '9755', '1069', '5539', '6159', 'v', 'c', 'q', 'q', '5635', '1249', 'd', 'e', '3513', 't', 'b', 'd', 'x', 'q', 'h', 't', '2847', '6533']

Ex Output:

b, c, d, e, h, l, n, p, q, t, v, w, x