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:
['8859', '575', 'l', 'e', '6575', '1303', '8643', '1395', '3171']

Ex Output:
e, l


Ex Input:
['219', '2065', '4045', 'k', 'n', 's', 'z', '7239', '1043', 'r', '2333', 'q', 'k', 'b', '2013', 'g', '6925', '9835', 'a', '5377', 'k', '8005', 'p', '9753', 'm', '201', '2353', 'f', 'n', '89', 'q', 'p', '7847', 's', 'l', '3359', '2269', 'v', 'm', '8247', '9665', 'u', 'w']

Ex Output:
a, b, f, g, k, l, m, n, p, q, r, s, u, v, w, z


Ex Input:
['9919', '9229', 'j', '9947']

Ex Output:

j