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: ['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: ['d', '1625']

A: d
****
Q: ['x', '2959', 'h', 'c', '5325', 'b', 'n', 'p', '3989', '8905', '8115', 'b', '2775', '5771', '2609', '1839', 'u', 'z', '6097', 'o', '1569', 'x', 'y', '4653', 't', 's', '1797', '41', 'x', 'z']

A:
b, c, h, n, o, p, s, t, u, x, y, z
****