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: ['5611', 'x', 't', 'p', '5711', '7079', '5251', '429', 'z', 'u', '8721', '9321', '79', 'i', '189', '3605', 'k', '445', 'r', 'k', 'o', '2189', '8521', '8849', '2651', 'm', '4149', '1577', '3085', '5275', '6413', '5265', '6089', 'r', 'f', '5013']

Output: f, i, k, m, o, p, r, t, u, x, z


Input: Consider Input: ['j', '6675', 'u', 's', '705', '8227', 'f', 'w', 'n']

Output: f, j, n, s, u, w


Input: Consider Input: ['p', '3263', 'a', 'm', 'o', 'x', '1621', '7995', 'i', 'r', 'z', 'q', 's', 'r', 'z', 'g', '4117', '5285', '7957', '6033', '6879', '5057']


Output: a, g, i, m, o, p, q, r, s, x, z