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.

[Q]: ['3821', '385', 'y', '8457', '6623', 'g', '5923', 'a', '7193', 'v', 'm', '8915', 'v', '5873', 'p', 't', 'w', 'y', '3617', 'h', 'w', 'j', '8047', 'u', '2271', 'v', 'a', '2181', 's', '1051', 'b', 'a', '9967', '987', 'z', '2255', '6349', '1249', '1397', 'q']
[A]: a, b, g, h, j, m, p, q, s, t, u, v, w, y, z


[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']
[A]: a, c, d, f, g, j, k, l, m, o, q, u, w, y


[Q]: ['s', 'd', 'd', 'm', 'i', 'g', '9021', 'e', 'z', 'l', '5779', '9361', '5003', '7155', '6157', 'a', 'w', '7999', 's', '353', 'o', 'e', '4257', '973', 'w', '8701', '9947']
[A]:
a, d, e, g, i, l, m, o, s, w, z