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: ['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']
Example Output: c, d, g, i, j, k, n, o, q, r, s, t, y, z

Example Input: ['1449', 'a', '6261', '303', '4651', 'n', 'u', '1595']
Example Output: a, n, u

Example Input: ['4585', '547', '7205', 'b', '6797', 'i', '8525', 'h', '7381', 's', 'y', 'a', '8641', '4549', 'o', '3501', 't', 'k', '5453', 'l', 'f', '2717', '8433', '2747', 'q', '5929', '349', '1317', '1903', '4423', '3855', '1407', 'd', 'b', 's', 'n', 'y', 'z', 'a', 'u', 'v']
Example Output:
a, b, d, f, h, i, k, l, n, o, q, s, t, u, v, y, z