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', 'c', 'o', 'e', 'n', 'q', 'w', '9475', 'w', '863', 'r', '2219', '3483', '5035', '8209', '7957', 'b', '3735', '1423', 'l', '3409', '7639', 'd']

Ex Output:
b, c, d, e, l, n, o, q, r, w


Ex Input:
['3019', 'g', 'q', 'u', '611', 'z', '3671', '8119', '1679', 'h', '2631', '655', 'k', '2837', 'e', 'f', 'e', 'f']

Ex Output:
e, f, g, h, k, q, u, z


Ex Input:
['n', 'r', 'm', '9213', 'o', 'g', '701', '1701', 'q', '3839', 'd', 'r', 'b', 'v', '7569', '269', '7889', '439', 'i', '1103', '7821', '9697', '9455', 'c', 'c', 'l']

Ex Output:

b, c, d, g, i, l, m, n, o, q, r, v