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:
['n', 'h', 'j', '5945', '8511', 'y', '7739', '4717', '2483', 'p', '9545', '7647', '9863', '5591', '5393', 'i', '9225', '589', '1497', 'j', 'm', '2397', 'a', 'd']

Ex Output:
a, d, h, i, j, m, n, p, y


Ex Input:
['u', '1805', 'l', 'l', '5449', 'r', '4471', 'a', 'u', 'c', 'q', '6463', '6717', '7025', '9359', 'q', 'h', '1989', '5497', 'h', 'd', 'c', '135', '5737', '1235', 'v', 'u', 'g', 'p', 't', '9223', '8289', '4489', 'n']

Ex Output:
a, c, d, g, h, l, n, p, q, r, t, u, v


Ex Input:
['5601', '7325', '9077', '8009', '1555', 'h', 'd', 'c', '3899', 'o', 'e', 'f', 'r', 'e', '9721', '1343', '5513', '9375', '6171', 'y', 'v', 's']

Ex Output:

c, d, e, f, h, o, r, s, v, y