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: ['h', 'u', 'y', '7677', '9441', '1769', 'v', '1433', 'l', '7739', 'a', '8305', 'n', 'a', '6711', '3161', 'e', 'u', '993', '2211', '4011', 'q', 'o']

Output: a, e, h, l, n, o, q, u, v, y


Input: Consider Input: ['i', 's']

Output: i, s


Input: Consider Input: ['v', 'o', '5545', '9043', '5883', 'p', '5705', 't', 'i', '8113', 'u', '7923', 'w', 'g', '5127', '4751', 'm', 's', 't', '9827', 'l', 'r', '9273', '7849', '5199', 'm', 'q', 'h', 'z']


Output: g, h, i, l, m, o, p, q, r, s, t, u, v, w, z