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.

Example Input: ['l', 'u', '3901', '341', '5801']
Example Output: l, u

Example Input: ['219', '2065', '4045', 'k', 'n', 's', 'z', '7239', '1043', 'r', '2333', 'q', 'k', 'b', '2013', 'g', '6925', '9835', 'a', '5377', 'k', '8005', 'p', '9753', 'm', '201', '2353', 'f', 'n', '89', 'q', 'p', '7847', 's', 'l', '3359', '2269', 'v', 'm', '8247', '9665', 'u', 'w']
Example Output: a, b, f, g, k, l, m, n, p, q, r, s, u, v, w, z

Example Input: ['1867', 's', '9581', 'j', 'd', '2245', 'n', 'w', '7071', '7307', 'v', '8265', '3839', 'y', '9205', '7143', '2293', 'a', '5093', 'z', '6383', '5947']
Example Output:
a, d, j, n, s, v, w, y, z