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]: ['4945', 'i', 'h', 's', '8925', 'i', '3995', 'f', '813', '1823', '3475', 'q', '2463', '9487', 'c', 'c', 'n', 'y', 's', '6269', 'a', 'u', 'd', 'd', '9291', '3187', '545', '7929', 'd', '1007', '7579', '8421', '4033', 'v', 'c', 'e', 'n', 'j']
[EX A]: a, c, d, e, f, h, i, j, n, q, s, u, v, y

[EX Q]: ['e', 'c', '4241', '2685', 'o', '9859', 'z', '2647', 'b', 'c', 'y', '1985', '5985', '5709', '6655', 'q', 'z', '9933', '6817', '6477', '1837', 'x', 'p', '9251', '3787', 'v', '5741', 'e', 'p', '493', '5949', '5519', 'v', 'g', '1403', 'z', 'h', 'z']
[EX A]: b, c, e, g, h, o, p, q, v, x, y, z

[EX Q]: ['b', 'a', 'w', 'q', 'g', 'o', 's', 'i', '2723', 'm', '3173', 'c', 'g', '3327', '3633', '9265', 'x', 'x', 'p', 'p', 'y', 'q', '8925', 'a', '7169', '8621', 'i', '9301', '7879', '9465', '2609']
[EX A]:
a, b, c, g, i, m, o, p, q, s, w, x, y