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: ['n', '7489', 'n', 'n', '9787', '7829', 'n', '3481', 'v', 'l', '8927', 'c', 'm', 'd']

Output: c, d, l, m, n, v


Input: Consider Input: ['1345', 'y', '7221', 'h', 'r', '3255', 'k', 'r', 'j', '8639', '467', 'f', 'k', 'n', 'k', 'j', 'l', 'w', '143', 'w', 'q', '5657', '589']

Output: f, h, j, k, l, n, q, r, w, y


Input: Consider Input: ['x', '6065', 'm', '1573', 'c', 'y', '4729', '7687', '9769', 'w', '1825', '4021', 'f', 'y', '8881', 'z', 'v', '8933', 'k', 'v', '4657', 'u', '515', '1293', '257', 'b', '9003', 'v', '3269', '2057', '4171', 'r']


Output: b, c, f, k, m, r, u, v, w, x, y, z