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: ['v', '2989', 'z', '7843', 'e', '9923', 'y', 'b', '7611', 'u', 'u', '6227', '3145', 'w', '6451', 'g', '3129', 'o', 'r', 'z', '8349', 'u', 'h', 'd', 'g', 'a']

Output: a, b, d, e, g, h, o, r, u, v, w, y, z

Input: Consider Input: ['887', 'p', '3819', '2727', '1407', 'b', 'n', '737', 'd', 'w', 'q', '6877']

Output: b, d, n, p, q, w

Input: Consider Input: ['n', 'c', 'n', 's', 's', 'x', '2727', '5247', '4323', '2559', 'q', '7461', '5117', '9699', 'z', 'd', '1271', 'x', 's', '693', 'u', '8763', 'e', '7979', '4993', '9483', 'i', '7841', 'o', '1019', '681']
Output: c, d, e, i, n, o, q, s, u, x, z