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:
['e', 'n', 'y', 'f', 'l', 'h', '455', 'y', '591', 'm', '9041', 'b', 'b', 'o', '4215', '5009', 'o', 'a', '4369', 'u', '6911', '4825', 't', 'k', '6063', '2939']

Ex Output:
a, b, e, f, h, k, l, m, n, o, t, u, y


Ex Input:
['2103', '7937', 'v', '7641', '6609', '269', '4463', '4333', 'c', '8407', '4883', '6283', 'a', '8643', '3365', '1929', 'v', 'o', '2107', '7453', '9157', '5581', '5187', 'f', 'k', '8227', '6295', 'b', 'y', '4995', '1187', 'k', 'n', 'p', 'z', '8165', 'n', '7345', 'l']

Ex Output:
a, b, c, f, k, l, n, o, p, v, y, z


Ex Input:
['q', '1967', '8115', '3019', '6805', '2349', '1185', '1567', '2301', 'c', '3421', 's', 'd', 'a', '4065', 'w', '1173', 'q']

Ex Output:

a, c, d, q, s, w