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: ['a', '2579', 'f', '6787', '123', '225', '6499', '4419', 'o', '1785', '7981', 'z', 'b', '2441', '2821', 'o', 'k', '2747', 's', 'u', 'q', '3901', '7629', 'k', 'm', 'q', '6577']

A: a, b, f, k, m, o, q, s, u, z
****
Q: ['r', 'j', '437', 'b', '5223', 'n', 'v', '437', 'd', '8285', 'k', 'j', 'r', 'p', 'n', 'e', 'n', 'j', 'o', '2651', 'j', '6365', 'q', 'q', '2159', 'g', '3641', '7727', 'c', '1197', 's', 't', 'n']

A: b, c, d, e, g, j, k, n, o, p, q, r, s, t, v
****
Q: ['i', 'l', 't', 'k', 'h', 'j', '6057', '8407', '8887', 'o', '8735', '27', '901', '9229', 'o', '3441', 'p', 'd', '3039', '2209', '9667', '3025', '2371', 'c', 's', '8709', 'w', 'd', '6673', 't', 'a', 'p', 'o', 'b', '6063', '2325', '6189', 'u']

A:
a, b, c, d, h, i, j, k, l, o, p, s, t, u, w
****