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: ['g', 'u', 'q', '1375', '9491', 't', 'w', 'c', 'v', 'y', '3169', '1607']

Output: c, g, q, t, u, v, w, y


Input: Consider Input: ['s', 'w', '8949', '4025']

Output: s, w


Input: Consider Input: ['d', 'i', 'c', 'w', 'w', '3777', '7573', 'u', 'a', '3087', 'h', '6815', '7031', 'j', '7087', '3933', '537', 'c', 'e', '2389', 'y', 'n', '4063', 'm', '9609', 'f']


Output: a, c, d, e, f, h, i, j, m, n, u, w, y