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]: ['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']
[EX A]: b, d, f, g, i, j, k, l, m, o, q, r, t, x

[EX Q]: ['1931', 'c', 's', '8767', 'z', '8977', '9249', '365', 'p', '7187', 'p', '961', 'k', 'k', '423', '5999', '4697', '6251', '6441', '1821', 's', 's', 'f', '5365', 'z', '5113', 'y', 'k', 'i', '5627', 'u', 'w', '4103', '8035', '7105', 'o', 'n', 's', 'y']
[EX A]: c, f, i, k, n, o, p, s, u, w, y, z

[EX Q]: ['r', '1525', '9707', '2685', 'm', '751', 'a', 't', 'j', '1983', '1783', '4541', '9919', 'o', '2943', '8045', '6655', '7529', '6317', '4017', 'i', 'u', 'p', '2239']
[EX A]:
a, i, j, m, o, p, r, t, u