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: ['u', 'd', '4193', '5687', 'p', 'r', '7787', 't']

Output: d, p, r, t, u


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: ['3949', 'i', 'n', 'g', 'v', '6575', '4629', '4195', 'd', 'z', 't', '205', '5865', '3231', 'q', 'x', 'y', 'w', 'p', 'e', '1225', '2577', '869', 'x', 'x', 'n', 'p', 'd', 't', 'f', '9263', '4153', 'f', '7305', '1579', 'c', 'p', '1041', 'z']


Output: c, d, e, f, g, i, n, p, q, t, v, w, x, y, z