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: ['m', '5005', 'y', 'h', 'w', '3609', 'p', '2539', '3307', 'p']

A: h, m, p, w, y
****
Q: ['6057', 'f', 'r', '9863', '6213', '9211', 'v', '7319', 'o', 't', '8845', '8245', '5521', '579', '5823', '9889', '3805', '7331', 't', '6125', 'c', 'd', '759', '3765', 'm']

A:
c, d, f, m, o, r, t, v
****