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.

['i', 'i', 'h', 'g', '5123', 'i', 'r', '3183', 'w', 'g', 's', '9777', '455', 'l', 'r', 'h', 'e', 's', 'v', '6823', '463', '9603', 'e', '947', '7071', 'c', '3373', 'j', 'w', 'm', 's', 's', '3483', '9567']
c, e, g, h, i, j, l, m, r, s, v, w

['a', 'w', 'm', 'g', 'c', '5475', '7391', 't', '1049', 'p', 'd', '1397', 'k', 'x', 'j', '2525', 'f', '741']
a, c, d, f, g, j, k, m, p, t, w, x

['h', '613', 'f', 'g', 'c', '429', 'g', 'c', 'c', 'z', '6135', '7421', '4959', 'h', '7515', '8597', '843', 'x', '6711', 'i', '5885', '1963', '6031', 'g', 'm', 'k', '3221', 'i', 'r', '8043', 'v', '3251', '7003', 'y', 'o', '9355', '7407']

c, f, g, h, i, k, m, o, r, v, x, y, z