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: ['r', 's', '2471', 'n', '635', 'k', '3551', '7041', '8765', '1221', '8439', '7773', '6471', 'u', 'p', '2093', '6479', '1435', '6881', 'a', 'y', 'm', 'r', '1627', 'w', 'k', 'b', '3095', '9059', '285', 'y', 'a', 'm', 'x', '637', 'i', '3407', 'e', 'e']

Output: a, b, e, i, k, m, n, p, r, s, u, w, x, y


Input: Consider Input: ['o', '4169', 'k', '7349', 'w', 't', '8271', '8781', '3725', '2865', '6053', 'j', 'z', '4211', '8231', '213', '6389', 'f', 'h', 'g', '9269', '4617', '4137', 'i', 'y', 'i', 'n', '4597', 'p', 'z', '3195', '3231', 'c', '1901', '1231', 'p', '4509', '2557', '3715']

Output: c, f, g, h, i, j, k, n, o, p, t, w, y, z


Input: Consider Input: ['x', 'c', '6801', '2225', '4275', '3891', '1399', 'e', '7811', 'h', '9277', '3557', '4239', 'n', '3745', '2403', '8921', 'q', '1045', '5225', 't', 'k', '3491', 's', 'e', '4443', '9141', '8735', '2231', '4817', 't', 'q', 'y', '3011']


Output: c, e, h, k, n, q, s, t, x, y