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.

[EX Q]: ['f', '9027', 'z', '9601', 'w', '7747', '1135', 'j', '1871', 'd', 'u', 'f', 'd', 'x', 'k', '2009', 't', '4625', 'm', '1619', 'm', 'm', '3107', 'x', '3957', '2495', 'j', '201', 'a', '4635', 'r', '7407', 'b', 'r', 'z']
[EX A]: a, b, d, f, j, k, m, r, t, u, w, x, z

[EX Q]: ['2775', '7507', 'c', '4417', '3449', 'y', 'z', 'e', 'f', '9515', '8555', '7269', '8353', '4239', '4347', '4479', '8645', '9925', 'o', 'h', 'o', '8641', 'y', '3251', '1191', 't', 'x', 'z', '7203', 'b', 'b', '7545', '7283', 'z', 'y', '8127', 'x', 'l', '6251', 'y']
[EX A]: b, c, e, f, h, l, o, t, x, y, z

[EX Q]: ['6241', '3441', '371', '9447', '6091', '6185', 'h', 'v', 'e', 'm', '4657', 'm', '6291', 'e', '9349', 'd', 'm', 's', 'w', 'g', '8537', '7305', 'z', '7613', '199', 'w', '7391', 'r', 'g', 'k', '6725', '5447', 'l', 'd', 'g', 'n']
[EX A]:
d, e, g, h, k, l, m, n, r, s, v, w, z