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.

Input: Consider Input: ['r', 'n', '7583', '8697', '7927', 'l', '5003', '1363', 'p', 'e', 'q', '6227', '6915', '8619', '9011', 'n', '3063', '3799']

Output: e, l, n, p, q, r


Input: Consider Input: ['t', 'u', 'y', 'y', 'b', 'x', 'q', '3713', '2679']

Output: b, q, t, u, x, y


Input: Consider Input: ['r', 'h', 'r', 'o', '7205', 'j', '9119', 'o', 's', 'q', 'c', 'l', '1125', '3171', 'c', '3785', '7267', '625', '2963', 'h', '5219', 'r', 'w', 'u', '9145', '6817', 'a', 'i', '8809', 'm', 'l', '6875', 'l', '9819', '7893']


Output: a, c, h, i, j, l, m, o, q, r, s, u, w