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: ['i', 'x', 'n', 'w', '8915', 'd', 'd', 'd', '6025', '7861']

A: d, i, n, w, x
****
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: ['f', 'e', '8483', 'm', '4753', 'o', 'i', 'm', 'x', '625', 'w', '2859', 'b', '5603', 's', '643', 'z', '6333', 'r', 'b', 'f', '2969', '9609', 'a', 'q', '8321', 'f', 'r', '1189', '6997', 'u', '3659', '7663', '615', '2803']

A:
a, b, e, f, i, m, o, q, r, s, u, w, x, z
****