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.
--------
Question: ['i', '1191', '5581', '2527', 'g', '9795', '519', 'u', '8389', '9793', 'k', '5733', '7125', '7835', 'j', '855', 'd', 'd', '6555', '3211', 'l', 'o', 'b', '523', 'x', 'j', '1707', '4161', '7171', 'h', 'h', 'm', 'h', '2443', 'e', '649', '951', 'n', 'h']

Answer: b, d, e, g, h, i, j, k, l, m, n, o, u, x


Question: ['j', '1733', 'p', '6741', '7933', '8943', '733', 'x', '1107', 'z', '1719', '7653', 'y', 'z', '6563', 'p', '4615', 'j', '4489', 'h', 'w', 'y', 'p', 'c', '7949', 'k', 'm', 'r', '9427', '7243', '9777', 'j', '323', '4095', 't']

Answer: c, h, j, k, m, p, r, t, w, x, y, z


Question: ['3529', '5693', '1533', 'c', 'a', 'c', '8517', '1465', 'i', 'l', 'd', 'x', '3153', '63', '241', '5685', '6539', 'u', 't', '8809', '759', 'e', '7919', '4713', 'o', 'u', 'u', '8643', 'x', '9309', 's', 'l', 'a', '5363', '2975', 'n', 'c', '1949', 'g', 'd']

Answer:
a, c, d, e, g, i, l, n, o, s, t, u, x