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: ['7367', '9757', '9431', 'h', 'a', 'k', '5833', '6237', 'g', '3585', '8665', 'g', '7517', '1561', 'p', 'p', '1307', '3325', 'q']

Output: a, g, h, k, p, q


Input: Consider Input: ['t', 'u', 'y', 'y', 'b', 'x', 'q', '3713', '2679']

Output: b, q, t, u, x, y


Input: Consider Input: ['7407', 'k', 'l', 'n', 'l', '7995', '1571', '9109', '4455', '3105', '6083', 'e', 'z', 'v', '6277', '1853', '2811', '8393', '5647', 'l', 'k', 'i', '6133', 'y', '7749', 'i', '6431', 'd', 'e', 'o']


Output: d, e, i, k, l, n, o, v, y, z