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: ['u', 'o', 'b', 'b', '5873', 'w', 'v', '4171', '7957', '3501', '2563', 'l', 'q']

A: b, l, o, q, u, v, w
****
Q: ['m', '3809', 'l', 'k', '1929', '7963', 'n', 'u', '2125', 'g', 'o', '8325', 'o', 'h', 'y', '3025', 'e', 'e', 'c', 'x', '8445', '4979', 'z', 'f', '4201', '4765', 'g']

A: c, e, f, g, h, k, l, m, n, o, u, x, y, z
****
Q: ['z', 's', '6699', '9277', 'p', '9009', '871', 'h', '6155', 'y', '9173', '6247', 'p', '5687', 'r', 'w', 'k', 'c', '1231', '6409', 'i', '3191', '5959', 'h', '2367', 't', 'w', 'x', 'p', '347', 'l', '5699', '8251', 'f']

A:
c, f, h, i, k, l, p, r, s, t, w, x, y, z
****