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]: ['x', 'i', 'r', '6011', 't', 'f', 'b', 'i', '8367', '4051', '1459', 'f', '5583', '9609', 'l', 'q', 'g', '8443', 'o', '8697', '7053', '8325', 'k', '7021', 'q', 'm', '6899', '9981', '8985', 'i', 'j', '8043', 'k', '535', '7603', '7629', 'k', '2779', 'g', '2049', 'x', 'd', '8527', 'k', 'q']
[A]: b, d, f, g, i, j, k, l, m, o, q, r, t, x


[Q]: ['7917', '2295', 'q', 'v', '9373', 'w', 'n', 'q', '5803', 'g', 'k', 'm', '2167', 'k', '6425', 'x', 'g', '341', 't', 'u', '8829', 'h', '4333']
[A]: g, h, k, m, n, q, t, u, v, w, x


[Q]: ['s', '9127', 'f', 'i', 'n', 'p', '687', 'e', 'h', 'o', 'b', '2947', '45', '1961', 'd', 'w', 'q', 'p', '5109', 'w', 'e', '9861', 'w', '617', '7047', '945', '8415', 'g', '5953', 'r', 'h', 'k', 's', '4273', '1327', '4347', 'w', 'z', '7745', '9919']
[A]:
b, d, e, f, g, h, i, k, n, o, p, q, r, s, w, z