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: ['r', 'y', 'c', '3211', '9245', '8459', '8521', '5781', 'w', 's', 'd', '5299', 'a', 'y', 'g', 'm', '6435', '8605', 'e', 'h', '6871', 's', '387', 'l', '5829', 'e', 'd', '9545', '2945', 'k', 'v', 't', '8449', '2199', 'm', '2599', '1489', '6623', 'x', 'l']

Output: a, c, d, e, g, h, k, l, m, r, s, t, v, w, x, y


Input: Consider Input: ['277', '8697', 'q', '2023', '5723', 'm', '8673', 'f', 'z', 'z', 'a', '9875', 'p', 'x', 'l', 'z', 'x', '619', '6509', 's', '2067', '571', 't']

Output: a, f, l, m, p, q, s, t, x, z


Input: Consider Input: ['229', '1831', 'l', '629', '617', '4385', 'd', 't', 't', '2825', 'c', 'k', 'h', 'j', '8313', 'v', 'x', 'x', 'p', 'd', 't', '6015', 'j', '8421', '3385', 'c', 't', '3975', '9783', 'j', '311', '9181', '9361', 'p', 'a', '9497', '7939', '6319', 'w', '9907', 's', '2341']


Output: a, c, d, h, j, k, l, p, s, t, v, w, x