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: ['c', 'h', '8655', 'r', '7531', 's', 'r', 'w', 'e', 's', 'p', '1709', '5447', 'b', '5855', 'w', 'f', 'i', '7809', 'q', '1975', 'z', '4037', 'k', 'l', 'z', 'g', '9739', '8801', '3405', '6549', '4561', 'd', '1669']

Output: b, c, d, e, f, g, h, i, k, l, p, q, r, s, w, z


Input: Consider Input: ['m', '7517', '9361', '9567', '8785', 'k', '5699', '3585', 'v', '1913', '1651', 'g', 'p', '2731', 'q', 'h', '467', 'r', '1091', '9801', 'a', '6645']

Output: a, g, h, k, m, p, q, r, v


Input: Consider Input: ['u', '5737', 'h', '813', 'l', 'j', 'c', '2549', '1789', '3753', '971', 'm', '6999', 'w', 'f', 'k', 'r', 'r', 'q', '3587', 'p', '2211', '3117', 'd', 'x', '9221', '7583', 'j', '5549']


Output: c, d, f, h, j, k, l, m, p, q, r, u, w, x