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: ['2349', 'p', 'a', '435', 'y', 'h', '3249', 'o']

Output: a, h, o, p, y


Input: Consider Input: ['u', 'k', 'd', '4393', 'u', 'h', 'q', '833', 'k', 'l', '5749', 'r', '7123', '1003', 'z', '531', 'o', 'u', '6601', '6975', '4905', 'n', 'e']

Output: d, e, h, k, l, n, o, q, r, u, z


Input: Consider Input: ['6663', 'w', 't', '9827', 'm', '1923', 'c', '3323', 'q', '761', 'a', '9125', 'g', 'x', '6165', 'k', '7939', 'h', 'p', 'q', 'i', 'z', 'h', 'w', '2965', 's', 'v', 'r', 'q', '4523', '2887', '4089', '2691']


Output: a, c, g, h, i, k, m, p, q, r, s, t, v, w, x, z