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:
['4653', 'e', 'c', 'j', '6739', '3963', 'q', '4649', 'v', 's', 'j', '9757', '8075', '6253', '4365', 's', '9101', 'd', '6989', 't', '5687', '7389', '139', '4029', '5073', 'q', 'e', '2455', '1075', 'j', '1329', 'l', '4689', 't', 'z', '4179', 's', 'l', 'w', 'n', '6569', '8907', 'v', '605', 'y']

Ex Output:
c, d, e, j, l, n, q, s, t, v, w, y, z


Ex Input:
['a', '3281', '9123', '5443', 'w', 'w', 'p', '9275', 'v', 'm', '3549', 'l', 'y', 'l']

Ex Output:
a, l, m, p, v, w, y


Ex Input:
['y', '5923', 'r', '3743', 'x', '1369', '2989', '2139', '3201', '225', 'n', '7015', 'd', '2059', '7873', 'c', 'b', 'w', 'a', '311', 'd', '4783', '1285', 'i', 'r', '8981', '7491', 'k', '9065', 'j', '9341', '9441', '871', '6991', 's', 'o', 'n', 'b', 'q', 'v', '6905', '6807', '8043', 'm']

Ex Output:

a, b, c, d, i, j, k, m, n, o, q, r, s, v, w, x, y