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.

Ex Input:
['f', 'a', 'r', '4009', 'k', 'a', 'g', '7725', 'v', 'b', '6705', 'a', '6583', '3159', 'c', 'w', 'x', 'h', '7625', 'p', 'y', '5645', 'k', 'r', 'j', '4175', 'r', '3103', '8631', '5999', 'p', 'g', 'h']

Ex Output:
a, b, c, f, g, h, j, k, p, r, v, w, x, y


Ex 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']

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


Ex Input:
['1147', 'y', 'k', 'g', 'w', 'i', 'w', '2883', '6467', '1709', '8637', 'w', 'i', '6897', 'i', '7607', '6567', '8105', '1779', 'j', '9639', 'o', 'w', 's']

Ex Output:

g, i, j, k, o, s, w, y