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.

['4743', '9687', '2887', '4413', 'r', 'w', '2355', 'l', 'd', '453', 'o', 'm', '4351', '5881', '3963', 'g', 'r', 'z', 'q', '7555', 'y', '9555', '405', 'n', 'l', '6733', '1763', 'v', '9925', 'y', '633', '827', 'w']
d, g, l, m, n, o, q, r, v, w, y, z

['p', 'k', 'i', '753', 'u', 'm', '3817', '1597', 'l', 'm', 'a', 'i', 'b', 's', 'c', '2561', 'x', '5363', '1173', '8657', '2033', 'b', 'p', '3093', 'k', '6535', '307', '9925', 'b', 'q', 'q']
a, b, c, i, k, l, m, p, q, s, u, x

['8485', '9305', '3941', '353', 'n', '749', '3019', '3245', '4021', 'v', '4457', '2403', 'h', '5947', 'a', 'y', '279', 'p', 'v', '2577', '1159', 'v', 'p', '3721', 'm', 'r', '591', 'k', 'j', 'z', 'o', '5979', 'k']

a, h, j, k, m, n, o, p, r, v, y, z

