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:
['1189', '7143', '993', '1513', '6449', '9749', '5963', '8159', 't', '3543', 'j', 'i', '4227', '1463', '6431', '4987', 'y', 'q', 'f', '321', 'm', 'r']

Ex Output:
f, i, j, m, q, r, t, y


Ex Input:
['i', 'i', 'h', 'g', '5123', 'i', 'r', '3183', 'w', 'g', 's', '9777', '455', 'l', 'r', 'h', 'e', 's', 'v', '6823', '463', '9603', 'e', '947', '7071', 'c', '3373', 'j', 'w', 'm', 's', 's', '3483', '9567']

Ex Output:
c, e, g, h, i, j, l, m, r, s, v, w


Ex Input:
['i', 'y', '2273', '7339', 'v', '7937', 'f', 'm', '9755', '7759', 'x', '8097', '2913', '9911', '7225', 's', 'e', 'x', '9867', 'i', 'h', 'l', '1717', '7373', '5713', 'c', '2111', 's']

Ex Output:

c, e, f, h, i, l, m, s, v, x, y