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.

[EX Q]: ['r', 'j', '437', 'b', '5223', 'n', 'v', '437', 'd', '8285', 'k', 'j', 'r', 'p', 'n', 'e', 'n', 'j', 'o', '2651', 'j', '6365', 'q', 'q', '2159', 'g', '3641', '7727', 'c', '1197', 's', 't', 'n']
[EX A]: b, c, d, e, g, j, k, n, o, p, q, r, s, t, v

[EX Q]: ['135', 'u', '3435', '2985', '9811', 'y', '4309', '9757', '905', 'd', 'g', 'q', '1457', 'l', 'o', 'u', '4517', '2333', '3327', '577', 'a', '4041', '8101', '6211', 'f', 'j', '1721', '7217', 'q', '7443', '8477', '3117', '7779', '9339', '8615', 'm', 'c', 'f', 'c', '8979', '7895', 'k', 'w', '1619']
[EX A]: a, c, d, f, g, j, k, l, m, o, q, u, w, y

[EX Q]: ['2583', 'w', '595', '6781', '9379', '3155', 'a', 'z', 'm', 's', '2871', 'f', '8015', 'f', 'v', '7405', 'd', 'z', 'z', '8153', '5385', '9547', '3197', 'q', 'e', '3305', 'y', '2949', '7007', 'p', '9145', '7267', 'y', 'z', 'c', 's', 'h', 'h', '4885', 'r', 'h', 'u', 'l', '9291']
[EX A]:
a, c, d, e, f, h, l, m, p, q, r, s, u, v, w, y, z