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: ['4993', 'n', '7115', 'f', 'd', 'q', '249', '3203', 'w', '5689', '4103', '7129', '603', 'e', 'z', '5571', '3241', '6029', '2721', '8451', 'o', '7841', 'p', '6271', 'r', 'b', '9481', '4045', 'v']

Output: b, d, e, f, n, o, p, q, r, v, w, z


Input: Consider Input: ['m', '8127', '7519', '4543', '2809', '9855', 'n', '6241', 'w', 'w', 'q', 'w', 'p', '8599', '7819', '3817', 'm', 'q']

Output: m, n, p, q, w


Input: Consider Input: ['9359', '2343', 'w', 'a', 'u', 'u', 'y', 'g', 'w', 'v', '7711', '1873', '6893', '4125', '1323', 'h', 'j', 'k', 't', '5409', 'a', 'r', 's', '6197', 'k', 't', 'q', 'i', 'v', 'c', 'c', '4037']


Output: a, c, g, h, i, j, k, q, r, s, t, u, v, w, y