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: ['8315', 'b', '4333', 'f', '6507', '6211', '3475', 'c', 'e', '8039', '661']

Output: b, c, e, f


Input: Consider Input: ['m', '3809', 'l', 'k', '1929', '7963', 'n', 'u', '2125', 'g', 'o', '8325', 'o', 'h', 'y', '3025', 'e', 'e', 'c', 'x', '8445', '4979', 'z', 'f', '4201', '4765', 'g']

Output: c, e, f, g, h, k, l, m, n, o, u, x, y, z


Input: Consider Input: ['m', '8489', '2717', 'j', '6681', 'f', 'u', '5783', 'k', 'm', 'y', '7989', '6715', '5343', 'l', '6985', 'i', 'o', '1303', 'm', 'g', '9525', 'm', '5735']


Output: f, g, i, j, k, l, m, o, u, y