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: ['c', 'a', 'p', 'p', '4203', '1587', '2953', '9809', '99', '5821', 't', 'i', '4213', '1809', 's', 'l', 'i', 'b', '9233', '3983', '7713', '1807', 'k', 'f', '7825', '5491', 'o', '1347', 'u', 'h', '3967', 'u', 'g', '6775', '1069', '9211', 'i', '3369', 'r']

Output: a, b, c, f, g, h, i, k, l, o, p, r, s, t, u


Input: Consider Input: ['9273', '5219', 'e', '9413', 'v', 'h', '5657', '797', '2303', '2119', '4791', '2757', '4983', 'h', '9681', '4503', '6657', 't', 'i', 'g', '9375', '9901', 'm', 'y', '6461', 'h', '6663', '9493', '5897', '8829', 'd', 'x', '901', '833', 'u']

Output: d, e, g, h, i, m, t, u, v, x, y


Input: Consider Input: ['n', 'o', '9071', '7973', '6737', 'i', 'a', 'b', '545', 'n', 'o', '3183', '4985', '7193', 'l', '9337', 'o', 'e', '2013', 'a', 'n', 'b', 'z', '1765', 'z', 'd']


Output: a, b, d, e, i, l, n, o, z