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: ['v', '2989', 'z', '7843', 'e', '9923', 'y', 'b', '7611', 'u', 'u', '6227', '3145', 'w', '6451', 'g', '3129', 'o', 'r', 'z', '8349', 'u', 'h', 'd', 'g', 'a']
Example Output: a, b, d, e, g, h, o, r, u, v, w, y, z

Example Input: ['3019', 'g', 'q', 'u', '611', 'z', '3671', '8119', '1679', 'h', '2631', '655', 'k', '2837', 'e', 'f', 'e', 'f']
Example Output: e, f, g, h, k, q, u, z

Example Input: ['u', '8937', 'q', 'o', '2227', 'u', 'g', '8869', '9573', '4047', 'y', 't', '2833', 'u', 'd', '2007']
Example Output:
d, g, o, q, t, u, y