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: ['5075', '9169', '4659', '7605']

Output: -1


Input: Consider Input: ['l', '6313', '3199', 'w', '249', '8747', '7391', '3871', '173', 'x', 'o', '8647', '4413', '3645', '6123', '701', 'q', '2147', '4289', '7333', '533']

Output: l, o, q, w, x


Input: Consider Input: ['w', 'l', 'z', '2295', 'm', 'y', 'd', '9437', '6351', 'b', '6149', '2451', '3407', 'z', 'a', 'y', '4361', '785', 'u', 'i', '6061', 'k', 'b', '321', '6553', 'm', '8263', 'r', 'v', 'g', '7107', '7451', 'r']


Output: a, b, d, g, i, k, l, m, r, u, v, w, y, z