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: ['s', '6723', 'l', '1573', '1129', 'n', '4277', '5003', 'y', '7563', 'c', '6747', '3105', 's', '3593', '8417', '8253', '4157', 'w', 'f', 'z', 'd', '9685', '1033', 'h', '4893', 't', 'j', '6821', 'z', 'a', 'u', '591', 'o', '1087', '2147', '1223', '2339', 'i', 'y', '9307', 'x', 'z', 'r', 'y']

Output: a, c, d, f, h, i, j, l, n, o, r, s, t, u, w, x, y, z


Input: Consider Input: ['q', '9033', 'p', 'z', '1743', '247', '967', '445', '9849', 'f', '9113', 'b', 'g', '6041', 'j', '927', 'i', 'p', '6821', 'q', '6701', 'f', 'j', 'o', 'y', 'c', '7981', 'b']

Output: b, c, f, g, i, j, o, p, q, y, z


Input: Consider Input: ['2221', 'g', 'o', 'b', '4445', '7451', '9049', '8853', 'a', '4609', '5457', 'p', '9447', '4289', '8145', '5093', 'm', '1729', 'w', '3265', 'y', '1337', 'g', '3451', '4607', 'p', '8295']


Output: a, b, g, m, o, p, w, y