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.

Input: Consider Input: ['8005', 'q', 'w', 'a', 'f', 'o', '6017', '7591', 'm', 'p', 'z', 'q', 'u', 'o', 'd', '6043', 'f', '3575', 'r', '2885', 'o', '3141', '621', '2375', 't', '5397', 'h', 'b', 'i', '3785', '1551', 'i', '8879', 'g', '5237', '7111', '2057', '1743', '9895', '2613', 'i', 'z', '677']

Output: a, b, d, f, g, h, i, m, o, p, q, r, t, u, w, z


Input: Consider Input: ['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']

Output: a, b, c, i, k, l, m, p, q, s, u, x


Input: Consider Input: ['h', 'e', '7883', '6985', '6499', '8943', '3487', 'x', '7091', 'w', '2753', 'g', '7249', '5641', 'h', '9701', 'z', '4749', '5609', '1283', 'a', '7649', 's', 'z', '6883', '1757', '2849']


Output: a, e, g, h, s, w, x, z