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]: ['2329', 'i']
[EX A]: i

[EX Q]: ['l', 'o', 's', '7411', '7847', '2557', '1977', '2863', '2325', '4177', '4183', '4241', '1005', '1137', '1371', 'v', 'p', 'a', '2453', 'l', '6315', 'l', '6463', 'n', '7645', '9669', '5411', '1631', '5995', 'z', '227']
[EX A]: a, l, n, o, p, s, v, z

[EX Q]: ['w', 'l', 's', '6737', '7231', '5435', 'f', 'c', '4925', '1423', '261', '1659', 't', '6315', '1157', 'i', '2237', '9265', 'w', '7679', 'k', '9547', 'u', '7305', '1205', '6081', 'l', 'c', 'm', 'm', 't', '7389', 'j', '4987', '9513', '4987', 'o', 'o', '6189']
[EX A]:
c, f, i, j, k, l, m, o, s, t, u, w