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: ['5345', 'f', '6605', 's', 'q', 'w', 'p', 'o', 's', 'u', 'i', '7339', '8379', 'h', '9547', 'b']

A: b, f, h, i, o, p, q, s, u, w
****
Q: ['6643', '6757', 'h', '1033', 's', 'c', '2003', 'p', '5483', 'f']

A: c, f, h, p, s
****
Q: ['7331', '9121', '4905', '2151', '8145', 'r', '8229', 'v', 'z', '1099', '1403', 's', 'b', 'j', '2265', 'm', '4183', '2225', 'u', 'v', '7593', '3125', '643', 'i', '9657', '2011', '4325', '9319', 't', '4225', '193', 'o', 'l', '2459', '2069', '331', '9663', 'j', 'v', 'u', 'd', '9231']

A:
b, d, i, j, l, m, o, r, s, t, u, v, z
****