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: ['2593', '1835', '5089', 'v', '9723', 'f', '9279', '4257', '2175', '655', 'q', 's', 'v', 'j', 'm', '4471', '6419', '1685', '2793', 'x', '509', 's', '4833', '2125', 'b', '6379', '1075']

Output: b, f, j, m, q, s, v, x


Input: Consider Input: ['y', 'i', '257', '3695', 's', '6717', '4817', '4117']

Output: i, s, y


Input: Consider Input: ['5001', '853', 'y', '3833', '3727', '9037', 'n', '8643', '1927', 'e', '3859', 'p', 'a', '7243', '1979', 'n', '8605', 's', '407', 'a', '8719', '335', '3133', '1305']


Output: a, e, n, p, s, y