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]: ['u', '4731', 'l', 'p', '1997', '601', 'n', 'l', 'p', '211', '7355', '6537', 'w', 'x', '1741', '8145', '3689', 'm', 'y', '6945']
[EX A]: l, m, n, p, u, w, x, y

[EX Q]: ['2453', 'r', 'd', '8499', 't', 's', 'h', 'a', 'm', '9271', 'g', '2599', '6209', 'o', 'i', '4069', 't', '6793', '7679', '6643', '7359', 'm', 'f', 'w', '775', '3347', '6161', '9745', 'i']
[EX A]: a, d, f, g, h, i, m, o, r, s, t, w

[EX Q]: ['c', '3265', 'z', '7395', '6145', 'u', 'j', 'r', 'n', 'g', 'o', '1305', 'u', 'l', '775', 'o', '4337', 'f', 'k', 't', 'v', 'p', '5923', '2501', 'x', '3225', 'z', '9097', 'e', 'k', '3111', '5505', '2191', '3791', 'e', 'i', '4811']
[EX A]:
c, e, f, g, i, j, k, l, n, o, p, r, t, u, v, x, z