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: ['1197', '305', 's', '1113', 'n', '2207', 'e', '227', '2833', '607', '3049', 'v', '4615', 'a', 'k', 'r', 's', '3571', 'f', '4215', 'f', '8985', '5559', '4111', 'u', '1433', '1943', '8831', 'w', 'x', 'o', '9023', 'u', 'y', 'p', 's', 'h', '8877', 'p', 'n', '8903', '5811']

Output: a, e, f, h, k, n, o, p, r, s, u, v, w, x, y


Input: Consider Input: ['8887', '1199', 'r', '7209', 'k', '7567', '7239', 'k', '5123', 'w', '4523', 't', 'd', '5289', '5737', '485', 'w', 't', '7651', 'v', '7213', '7687', 'y', 'w', '7265', 'b', 'b', '3667', 'z', '9935', 'i', 'l', 'u', '6715', 'j', '9815', '8925', '7941', 'w', 'm', '3907', '621', '5523', '5849']

Output: b, d, i, j, k, l, m, r, t, u, v, w, y, z


Input: Consider Input: ['y', 'c', 'r', '4211', 'p', 'p', 'b', 'l', 'u', '4247', 'x', '4387', '7701', 'v', '5439', '6897', '1761', '3237', 'b', '33', 't', '6299', '1385', 'z', '7823', 'u', 'h']


Output: b, c, h, l, p, r, t, u, v, x, y, z