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: ['2161', '8009', '3057', 'r', '3897', 'd', 'j', '2727', 'b', '3231', 'i', '9227', '393', '5799']

Output: b, d, i, j, r


Input: Consider Input: ['1649', 'l', 'i', '5901', 'o', 'g', '1197', 'a', '9327', '9835', '1095', 'k', '4489', '9149', 'o', '3095', 'z', 'u', 'y', '561', '7419', 't', 'j', '8763', 'v', '339', 'y', 'w', 'v', 'v', '1867', 'd', 'r', 'w', 'h', 'j', '1531', '3841']

Output: a, d, g, h, i, j, k, l, o, r, t, u, v, w, y, z


Input: Consider Input: ['g', 'e', 'g', '1121', 'g', 't', '1145', 'h', 'i', 'p', 'c', 'x', 'q', '3287', '579', '7599', 'a', 'd', 'm', '3395', '6299', 'l', 'd', '5841', '3867', 'u', 'o', 'r', 'y', '535', '6207', '6891', '8967', 'w']


Output: a, c, d, e, g, h, i, l, m, o, p, q, r, t, u, w, x, y