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:
['5859', 'x', 'z', 'v', 'l', 'z', 'g', 't', 'x', '341', '7023', '4937', 'b', 'n', 'y', 't', 's', '1369', '4461', 'f', '1315', 'l', '5221', '6583', 'h', 'j', 't']

Ex Output:
b, f, g, h, j, l, n, s, t, v, x, y, z


Ex Input:
['4009', 'y', '9077', 'p', 'q', '6711', '6443', '5491']

Ex Output:
p, q, y


Ex Input:
['2375', '963', '2579', '1709', 'y', 'p', 'c', '1865', 'c', '2551', '5449', 'z', '9023', 'w', 'x', 'm', '6111', 'y', 'l', 'p', '4689', 'w']

Ex Output:

c, l, m, p, w, x, y, z