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.

[Q]: ['9783', '3185', '8225', 'u', '1123', 'd', '3453', 'i', '7713', '8457', '8609', 'h', '2767', 'e', '7191', '2929', '1089', '393', 'e', 'd', '11', '9329', '683', '1271']
[A]: d, e, h, i, u


[Q]: ['1649', 'l', 'i', '5901', 'o', 'g', '1197', 'a', '9327', '9835', '1095', 'k', '4489', '9149', 'o', '3095', 'z', 'u', 'y', '561', '7419', 't', 'j', '8763', 'v', '339', 'y', 'w', 'v', 'v', '1867', 'd', 'r', 'w', 'h', 'j', '1531', '3841']
[A]: a, d, g, h, i, j, k, l, o, r, t, u, v, w, y, z


[Q]: ['t', 'c', 't', 'n', 'v', 'm', '6619', '9731', 'b', 'o', 'p', '8943', 'e', 'o', 'a', '9423', 'p', '4881', '4263', '2887', 'n', 'f', '9591', 'k', '1529', '5973', 'q', 'i', 'm', 'a', '8837', 'n', '9165', '503', 'a', '9367', 'e', '1483', '737', 'v', 'e', 'x', '7439', '8865']
[A]:
a, b, c, e, f, i, k, m, n, o, p, q, t, v, x