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: ['5431', 'o', 'u', 'l', 'f', 'd', 'r', '1479', '9357', 's', 'v', '6399', 'b', '7937', 't', '8497', 'r', '131', 'h', 'c', 'v', '8879', 'k', 'r', '4687', 'l', '1065', 'r', 'w', 'l', '3305', '461', 'q', 'h', 'b', 'e', 'e', 'w', '5999']

Output: b, c, d, e, f, h, k, l, o, q, r, s, t, u, v, w


Input: Consider Input: ['7653', 'n', '697', '4565', 't', '7275', '2429', '1365', '7059', 'o', '8053', 'j', '2837', '957', '851', 'z', 'd', 'd', 'y', 'c', '7467', 'o', 'i', '9519', 'q', 'g', '7911', 't', 'g', '3439', '5821', '8433', 'k', 'z', 's', 'g', '685', 'i', 't', 'r', '6881']

Output: c, d, g, i, j, k, n, o, q, r, s, t, y, z


Input: Consider Input: ['5141', '8567', 'k', 'k', 'f', '8019', 'm', '2029', '6507', '1927', 'z', 'z', '7073', 'z', '1191', '9257', 'y', 'y', 'w', 'b', '7179', 'j', 'j', '4861']


Output: b, f, j, k, m, w, y, z