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.

Example Input: ['s', '6723', 'l', '1573', '1129', 'n', '4277', '5003', 'y', '7563', 'c', '6747', '3105', 's', '3593', '8417', '8253', '4157', 'w', 'f', 'z', 'd', '9685', '1033', 'h', '4893', 't', 'j', '6821', 'z', 'a', 'u', '591', 'o', '1087', '2147', '1223', '2339', 'i', 'y', '9307', 'x', 'z', 'r', 'y']
Example Output: a, c, d, f, h, i, j, l, n, o, r, s, t, u, w, x, y, z

Example Input: ['6697', 'j', '1571', '4989', 'o', '1143', 'i', '2969', '2541', '4899', 'i', '4751', 'n', 'b', '801', '4357', '3855', '49', 'm', '211', '7281', '121', '5231', '8313', '8967', '8043', '7699', 'r', '4315', '8637', '3339', '4437']
Example Output: b, i, j, m, n, o, r

Example Input: ['1461', 'k', 'e', 'h', '5585', '7905', '3597', '4801', 'k', 'r', 'w', '1313', '8479', '9947', '6851', '9725', '8653', '1895', '8245', 'r', 'r', '3289', 'd', 'v', '7307', 'l', 'n', '5441', '9773', 'u', '8913', 'l', 'i', 'y', 'o', '6111', 'k', 'a', '7939', '9247', 'q']
Example Output:
a, d, e, h, i, k, l, n, o, q, r, u, v, w, y