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.

['a', 'y', 'v', 'f', 'x', 'k', 'f', 'j', '6245', '6289', 'd', '6909', '8701', 'm', '3277', 'f', 'j', 'j', '9227', '8663', '5771', 'j', 'n', 'u', '7837', 's', '2539', '6363', 'g', 'a', '1009', 'v', '1483', 'x', 'i']
a, d, f, g, i, j, k, m, n, s, u, v, x, y

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

['s', 'y', '9361', 'm', '8455', 'u', 'j', 'o', 's', 'k', 'm', 'a', '8157', 'e', 'z', '9793', 'h', 'u', '3527', 't', 'o', 'u', 'l', '1381', '6485', '5587', 'y', '4845', '4107', '4233', '4813', '8829', 'i', '6093', 'k', 'h', '4999', '449', '8679', 'e']

a, e, h, i, j, k, l, m, o, s, t, u, y, z