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: ['g', 'p', '2925', 'n', 'o', 'y', '6381', 'l', '4963', 'g', 'm', 'u', 't', '9389', '3787', '7713', '1251', '779', 'i', 'w', '9869', 'y', 'y', '3881', 'k', 't']

A: g, i, k, l, m, n, o, p, t, u, w, y
****
Q: ['f', '165', 'm', '9975', '9259', '6505', 'a', 'g', 's', '1127', 'h', 'n', 'c', '6475', 'c', '8657', 'a', '4057', 'm', 'y', 'w', 'm', '6567', '7297', '285']

A: a, c, f, g, h, m, n, s, w, y
****
Q: ['n', 'd', 'j', 'j', 's', 'e', 'x', 'l', '4535', '3059', 'l', '9213', 'i', '2981', 'j', '7619', 'c', 'z', '2085', 'l', 's', '3125', '103', 'w', 's', 'a', 't', 'k', 'o', '3955', '241', '2227']

A:
a, c, d, e, i, j, k, l, n, o, s, t, w, x, z
****