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:
['8495', 'p', 'j', 'm', 'n', '9115', '1183', 'r', 'r', '8735', 'a', 'i', 'k', 'p', '8927', 'r', '9283', '9563', 'g', '2503', 'h', '1091', '5257', 'a', '3061', '2835', 'l', 'w', 'j', '7617', '8793', '7463', 'h', '8467', '7337', 'b', '4655', 'd']

Ex Output:
a, b, d, g, h, i, j, k, l, m, n, p, r, w


Ex Input:
['h', 'g', '4563', 'v', 'm', '107']

Ex Output:
g, h, m, v


Ex Input:
['5459', 'v', 'i', '5877', 'e', 'q', '1585', 'o', 'z', '3305', 'h', '8545', '449', 'b', '481', '8277', '2151', '4751', 'p', 'x', 'e', '1809', 'p', 'x', 'w', 'h', '3543', 'i', 'a', '9055', 'd']

Ex Output:

a, b, d, e, h, i, o, p, q, v, w, x, z