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]: ['6463', '871', '5781', '283', '9653', 'f', '9661', '3365', '2889', '5499']
[EX A]: f

[EX Q]: ['p', 'g', 'q', 'e', '8045', '9999', '9555', '7995', '7195', 'z', 't', '5223', '3699', 'i', '4797', '3817', 'x', 'y', 'w', 'o', '8915', '7803', 'n', '1117', 'c', '9647', 'p', 'e', '9669', '4845', '9255', '4545', '3693', '6871', 'w', '4327', '3285', 'k', 'f', 'x', 'i', 'b', '5967', '6601']
[EX A]: b, c, e, f, g, i, k, n, o, p, q, t, w, x, y, z

[EX Q]: ['h', 's', '9911', '3623', 'p', '515', '9243', 'u', 'f', '9757', '6077', '1451', '2955', '9321', 'y', '4575', 'f', 'k', '6095', '6477', '7073', '2071', 'v', '2803', 'o', '4845', 'u', 'p', '1827', '7045', 'g', '1371', '7317', 'c', '7115', 'z', 'e', 's', '9335', '9697']
[EX A]:
c, e, f, g, h, k, o, p, s, u, v, y, z