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.

['6209', 'x', 'j', 'w', '7965', '4905', '6297', '4291', '7183', 'a', 'l', '5267', 'r', '5935', 'a', '7865', 'h', 'p', '6117', 'a', 'y', 'y', 't', 'v', '7271', 'e', 'e', 'z', 'i', 'l', '4731', '2059', 'm', '5703', 'k', 'f', '8125', 'e', '7569', 'r', '2287', '593']
a, e, f, h, i, j, k, l, m, p, r, t, v, w, x, y, z

['y', '8115', 'f', '5333', 'f', '3437', 'b', 'e', '5719', 'm', 'w', '95', '4863', 'k', '4895', 'a', '8179', 'm', '7919', '1731', '229', 'r', '1847', '7559', '6669']
a, b, e, f, k, m, r, w, y

['o', 'o', '4143', '7705', 'n', '9519', '443', 'a', 'z', '2607', 'k', 'o', '5751', 'n', 'v', 'f', 's', 'r', 'c', '6153', '9139', '5801', 'g', 'm', '3479', 'e', 'i', 'e', '2013', '4839', 'f', 'j', '8613', '899', 'c', '3547', 'c', 'b']

a, b, c, e, f, g, i, j, k, m, n, o, r, s, v, z