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:
['m', '6537', '4063', '6413', 'k', 'd', '2479', 'p', '2251', 'q', '7079', 'r', 'd', 'p', '3347', '1391', '9847', '4487', 'u', '6951', '5285', '5837', '6747', 'r', 's', 'c', 'x', 'b', 'q', 'y', 'd', '331', '679', 'v', '1919', 'f', 'p', '1267', '3151']

Ex Output:
b, c, d, f, k, m, p, q, r, s, u, v, x, y


Ex Input:
['1733', '9355', 'o', 'j', 'i', 'e', 'w', '5445', 't', 'd', 'h', '1953', '827', '2205', '8029', '3637', '7855', '8067', 'v', '3125', 'c', 'f', '1607', '593', 'm', '1315', 'd', 'k']

Ex Output:

c, d, e, f, h, i, j, k, m, o, t, v, w