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.

['c', '8785', 'u', 'i', 'i', '6513', '6093', 'w', 'i', 'x', '9377', 'p', '1545', '7997', 'a', 'c', '125', 'u', '9149', '9103', 'u', 'o', 'h', '2275', '8503', '3251', 'c', '9925', 'w', '6873', 'c', 'h', 'e', '2369', 'c', 'z', '1337', '9541', '675', 's']
a, c, e, h, i, o, p, s, u, w, x, z

['907', '2407', '1385', '3593', 'x', '4143', '2271', '8361', 'q', '5093', 'd', '257', 'm', 'a', '5751', '7845', '3925', '3517', '7753', 'e', '5803', '2629', 't', 'e', '845', '6157', '9787', '225', 'j', 'j', 'l', '1321', 'k', '2459', 'u', '9113', '3193', 'a', 'j', 't']
a, d, e, j, k, l, m, q, t, u, x

['7709', 'n', '4823', '49', 't', 'z', '2791', '5047', '7039', '5763', 'z', '8955', 'r', 'd', '9675', 'f', 'y', '3333', 'v', 'a', '5867', '9329', '777', 'j', 'z', 'l', '4209', '183', '1371', 'i', 'r', 'i', '4209', '9521', '3839', '6075', 'o', 'c', 'c', '4025', 'n', 'g', '5903', '6475']

a, c, d, f, g, i, j, l, n, o, r, t, v, y, z