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: ['t', 't', 'p', '3245', 'x', 'g', 'i', 'u', '2599', '8613', 't', 'v', 'p', '5635', 'y', '9567', '5193', '8617', 'q', 'f']

Output: f, g, i, p, q, t, u, v, x, y


Input: Consider Input: ['135', 'u', '3435', '2985', '9811', 'y', '4309', '9757', '905', 'd', 'g', 'q', '1457', 'l', 'o', 'u', '4517', '2333', '3327', '577', 'a', '4041', '8101', '6211', 'f', 'j', '1721', '7217', 'q', '7443', '8477', '3117', '7779', '9339', '8615', 'm', 'c', 'f', 'c', '8979', '7895', 'k', 'w', '1619']

Output: a, c, d, f, g, j, k, l, m, o, q, u, w, y


Input: Consider Input: ['1439', '9177', '6479', 'n', '1693', 'f', '7795', '4791', '6025', 'q', '3517', 'l', 'c', 'k', '855', '769', 'r', 'u', 'k', 'g', '7285', '2279', 'n']


Output: c, f, g, k, l, n, q, r, u