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.

['j', 'y', '9907', 'a', '5715', 'l', '9817', '1949', '2697', '2255', '9571', '8957', '9329', '6055', 'z', 'q', '1185', '4593']
a, j, l, q, y, z

['d', 'a', '6931', 'c', 'u', 'z', '9713', 'v', 'm', 'e', 'k', 'o', '9705', 'a', '5373', 'c', '2983', '8097', 'h', '3039', 'g', 'f', 'n', 'v', '853', '8227', '7573', 'j', 'h', 'k', 'o', 'k', '8897', 'd', 'g', 'd', 'd', '4039']
a, c, d, e, f, g, h, j, k, m, n, o, u, v, z

['4073', '5519', '3893', '5163', '1121', 'p', 'q', 'o', 'u', '8173', 'i', 'i', 'm', '8293', '1263', '3379', 'b', 'k', 'n', '749', 'i', 'd', '2597', 'k', '4263', '5759', 'c', '8981', 'q', '4037', 't', 'c', '8385', 'w', 's', '8491', '4099']

b, c, d, i, k, m, n, o, p, q, s, t, u, w