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]: ['w', 'g', '1649', 'a', '2115', '6763', 'r', 't', 'l', 's', 'y', '5659', 'a', 'b']
[A]: a, b, g, l, r, s, t, w, y


[Q]: ['z', '5601', '5675', 'w', 's', 'z', '9213', '9563', '1699', 'p', 'g', 'm', 'c', '9279', '4481', 'p', 'n', '2389', 'c', '503', '1901', '8827', '1701', '1607', '5633', 'a', 'z', 'g', '3175', 's', 'l', 'l', '6811', '1821', '693', '8277', 'q', '8623', 'o']
[A]: a, c, g, l, m, n, o, p, q, s, w, z


[Q]: ['q', 'p', '6857', 'k', '9599', 'b', '8575', '893', '8247', '7047', '5137', '7171', '9643', '4883', 'l', '6495', '6867', 'y', '5231', 'c', '4295', '5859', '6507', '7569', '9985', '4237', '4593', '3299', '5649', '4959']
[A]:
b, c, k, l, p, q, y