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]: ['9271', '6393', '6005', 'x', '2301', '3999', 'p', 'z', 'j', '1033', '7555', 'r', 'r', 'y', '8917', '5939', '4031', 'e', '8095', 'g', '6095', 'a', '4133', '6471', '2129', '8021', '1093', 't', '8805', '545', 'k', '3249', 'l', '1561', '9909', 's', '1963', 'o']
[EX A]: a, e, g, j, k, l, o, p, r, s, t, x, y, z

[EX Q]: ['h', 'g', 'j', 'i', 'y', '7799', 'y', 'e', 'y', 'e', '6757', '3349', '1213', '191', 'd', '2149', '849', '8325', 'b', '6087', 'w', '7211', '7801']
[EX A]: b, d, e, g, h, i, j, w, y

[EX Q]: ['411', '7717', '2399', 't', 'n', 'h', 'u', '4091', '5597', 'v', '1157', '2677', 'a', '1635', 'w', '4879', '8973', 'l', '8335', 'l', '327', '5579', '3275', 'l', '673', '8475', 'm', '237', '3185', 'c', 'n', 'j', '685', '1173', 'c', '1355', 'r', 'l', 'p', 'j', '5331', '6801', '8109']
[EX A]:
a, c, h, j, l, m, n, p, r, t, u, v, w