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: ['e', 'z', '5199', 'x']

Output: e, x, z


Input: Consider Input: ['8879', 'x', '1383', '4925', '2867', 'j', 't', 'e', 'w', 'p', 't', 'w', 'l', '7447', '1877', '7747', 'k', 'b', 'x', '8565', 'q', '8575', '5711', '2949', '5637', '2197', '4905']

Output: b, e, j, k, l, p, q, t, w, x


Input: Consider Input: ['n', 'i', 'k', '2211', 'c', 'q', 'y', '9983', 'i', '9733', '1507', '4579', 'b', 't', '1549', 'b', '2739', '2265', '3847', '9765', '9767', 'r', 'c', '3185', '1965', 'o', '3661', 'q', 'f', '3291', 'm', '6639', '6675', 'h', 'b', '143', '3205', '3035', 'n', '9553', 'x', 's']


Output: b, c, f, h, i, k, m, n, o, q, r, s, t, x, y