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:
['9025', '3259', '4863', 'u', '6443', '9931', '627', 'x']

Ex Output:
u, x


Ex Input:
['231', 'r', '5673', 'j', '589', 'z', '4659', 'a', '3763']

Ex Output:
a, j, r, z


Ex Input:
['4423', 'i', '6171', 't', '8307', '1025', 'h', '7699', '7093', 'l', '6491', '8077', '9891', '4577', 'i', '8003', 'n', '5029', 'o', '2685', 'k', 'h', 'f', 'v', 'p', '6783', 't', 'c', '5701', '5157', '2203', '681', 'h']

Ex Output:

c, f, h, i, k, l, n, o, p, t, v