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: ['1595', '2915', 'o', 't', 'c', 'h', '3969', '5407']

Output: c, h, o, t


Input: Consider Input: ['o', '369', 'z', '5721', 'w', 'v', '4973', '7773', 'k', '3071', '5103', '425', '4239', '7977', 'n', 'i', 'k', '8117', '9843', 'n', 'd', '1353', 'h', 'd', 'v', 'z', 'j', '8727', '6997', 'x', '767', '4331', 't']

Output: d, h, i, j, k, n, o, t, v, w, x, z


Input: Consider Input: ['5029', 'g', '6853', '5053', 'p', '1243', 'p', 'q', 'd', 'e', '9905', 'c', '5677', 'c', '4005', '9243', 'p', 'c', 'l', 'r', '1169', '9081', 'y', '173', '401', '8457', 'r', 'x', 'x', '2333', '19', 'j', 'x', 'i', '3305', '9129', 'z', '6883', 'a', 't', 'j', 'f', '9883', '9565', '6027']


Output: a, c, d, e, f, g, i, j, l, p, q, r, t, x, y, z