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: ['p', '5229', '7521', 'y', 'n', 'u', 'c', '4047', '781', 'a', '4707', '7149', 'j', 'm', 't', '515', '7691', 'h', '4879', 'j', '6593', 'n', 'p', '2949', '1343', 'y', '2629', 'p', 'b', 'b', '2861', 'a']

A: a, b, c, h, j, m, n, p, t, u, y
****
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: ['e', '679', '5095', '8111', '8593', 'n', 'e', 'u', 'f', 'h', '7069', '9405', 'g', 'm', 'o', 'w', 'w', '7105', 'f', '1969', '1391', 'i', 's', 'l', 'y', '8059', 'r', '3193', 'q', '2493', '367', '6585', '1577', 'x', 'p', '6569', '6591', 'e', 'm', '2941', 'b', '7013', 'o']

A:
b, e, f, g, h, i, l, m, n, o, p, q, r, s, u, w, x, y
****