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: ['l', '6313', '3199', 'w', '249', '8747', '7391', '3871', '173', 'x', 'o', '8647', '4413', '3645', '6123', '701', 'q', '2147', '4289', '7333', '533']

Output: l, o, q, w, x


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: ['9571', 'b', 'w', '4477', 'o', 'x', 'f', 'm', 'w', '603', 'b', 'n', 'w', 't', 'a', 'r', 'c', 's', 'e', '1713', '8653', '7271', '6229', 'y', 'r', 'e', '171']


Output: a, b, c, e, f, m, n, o, r, s, t, w, x, y