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:
['7203', '8715', '3193', 'w', '7159', '8535', 'i', '2425', 'j', 'f', '6709', 'w', 'w', 's', 'e', '9337', 'r', 'r', '5255', '1707', 'u', '1443', 'e', 'e', 'v']

Ex Output:
e, f, i, j, r, s, u, v, w


Ex Input:
['2521', '8027', 'm', '193', '615', 'l', '1947', '5949', '6307', 'r', '1015', '743', 'v', '6949', 'b', 'g', '8841', 'c', 'b', '2879']

Ex Output:
b, c, g, l, m, r, v


Ex Input:
['1463', '3267', 'h', 'a', 'q', '7589', '3435', 'c', '6965', 'm', 'w', 'g', 'x', '9661', '4555', '87', 'o', '3725', '3873', '2779', 'r', '3525', 'g', '9605', 't', '9265']

Ex Output:

a, c, g, h, m, o, q, r, t, w, x