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: ['5463', '5683', 'w', '4071', '3997', 'i', '9677', 'q', 'l', 'v', 'w', '5325', '197', 'g', 'g', '3227', '3477']

Output: g, i, l, q, v, w


Input: Consider Input: ['3947', '4809', 'b', 'a', '4769', '4179', '535', '5965', 'f', 'j', '2265', 'w', '3103', 'u']

Output: a, b, f, j, u, w


Input: Consider Input: ['5629', '4415', '2903', '4659', 's', 't', '3099', '2875', 'o', 'f', 'o']


Output: f, o, s, t