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: ['h', 'g', 'j', 'i', 'y', '7799', 'y', 'e', 'y', 'e', '6757', '3349', '1213', '191', 'd', '2149', '849', '8325', 'b', '6087', 'w', '7211', '7801']

Output: b, d, e, g, h, i, j, w, y


Input: Consider Input: ['r', 'q', '3649', 't', '3941', 'z', '3729', 's', 'g', '6905', 'h', 'v', '1085', '6353', 'a', '9395', '5433', 'a', '2565', 'p', 'a', 'h', '1491', 'j', 'b', 'v', 'e']

Output: a, b, e, g, h, j, p, q, r, s, t, v, z


Input: Consider Input: ['e', 'c', '6007', 'm', '7477', 'b', '3007', '3185', '239', '8747', '2617', 'd', 'g', '2089', '5745', '3003', 'l', 'c', 'y', 's', 'o', '8895']


Output: b, c, d, e, g, l, m, o, s, y