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]: ['z', '2519', '4799', '4715', '7165', 'r', 'r', 'l', 'n', '6925', '8935', '9795', '5489', 'v', 'u', '6527', '2241', 'u', 'c', 'w', '9755', 'w', '9823', 'g']
[A]: c, g, l, n, r, u, v, w, z


[Q]: ['6575', '2057', '2135', '6259', '7741', '4919', '7461', 'v', '401', 'h', 'u', '2391', '2181', 'y', '9273', 'd', 'b', 's', '7993', '9323', 'b', '7015']
[A]: b, d, h, s, u, v, y


[Q]: ['9789', 'k', 'w', 'j', '5965', '8869', 'r', 'q', '1779', '679', 'g', 'l', 'f', 'o', 'a', '8339', '7715', '3687', '6967', '1175', '6569', 'd', '5593', 'x', 't', '205', 'b', '4039', 'w', '5993', '4527', '7335', '5601', 'q', 'o', '4725', '7553', '3219', 'e', 'n', '913']
[A]:
a, b, d, e, f, g, j, k, l, n, o, q, r, t, w, x


