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.
--------
Question: ['q', '8149', '4087', '5183', 't', 'j', 'e', 'g', 'r', '2125', 'y', 'l', 'g', '3673', 's', 'r', 'e', 'v', '4259', 'v', '3477', '9353', '3639', 'v', 'n', 'e', 'z', '5071', 'x', '6287', 'e', 'e']

Answer: e, g, j, l, n, q, r, s, t, v, x, y, z


Question: ['1593', '8165', 'q', '6689', 'b', 'r', '373', 'g', '6505', '415', '495', 'j', 'j', 'f']

Answer: b, f, g, j, q, r


Question: ['a', '1379', '6041', 'z', 'h', 'k', '8137', '9717', '9499', 'p', 'g', '5575', '4037', '7279', '7585', '1119', 'i', 'h', '5759', 'm', '6037', 'k', '643', '1453', '1169', '6051', '8151', 'c', '789', '2211', '7589', 'd', 'f', 'i', 'q', 'h', '2011']

Answer:
a, c, d, f, g, h, i, k, m, p, q, z