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: ['b', 'a', '7411', '4471', 'z', 'l', '2051', 'q', '6749', '8647', 's', 'y', 'h', '9319', 'e', '5419', 'y', 'q']

Output: a, b, e, h, l, q, s, y, z


Input: Consider Input: ['2599', '7501', '1677', '9677', 'd', '2281', '3545', 'k', '9273', '5717', 'e', 'o', '5311', '3599', 'x', '5561']


Output: d, e, k, o, x