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:
['5433', '4011', '2113', '2299', 'e', '9829', 'd', 'q', 'e', '3921', 'a', 'q', '8953', 'q', 'g', 'w', 'z', 'u', '4425', 'b', 'q', '5315', 'b', 'u', 'h', 'y', '9733', 'b', 'c', '1225', 'a']

Ex Output:
a, b, c, d, e, g, h, q, u, w, y, z


Ex Input:
['u', 'o', 'b', 'b', '5873', 'w', 'v', '4171', '7957', '3501', '2563', 'l', 'q']

Ex Output:
b, l, o, q, u, v, w


Ex Input:
['5483', 'v', 'v', 't', 'w', 't', '5701', '9647', '3825', '6543', '6673', 'g', 'e', '7029', '7413', 'f', 'y', '2931', 'k', '4315', '8861', 'q', 'e', 'c', 'o', 's', '7997', 'y', 'h', '5045', 'j', '1163', 'c', 'g', 't', 'a', '4423', '6673', '3659', '7401']

Ex Output:

a, c, e, f, g, h, j, k, o, q, s, t, v, w, y