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: ['q', 'o', '1205', '4429', '6301', 'e', '2857', '5075', '5121', 'p', 'b', '5801', 'a', 'm', 'j', 'p', '1279', '7011', 'x', '2557', 'k', 'v', 'b', 'u', 'w', 'n', '1689', 'o', '1583', 'w', '6403', 'p', '6397', 'e', '823', '5699', 'd', '3399', 'd', 'b']

Output: a, b, d, e, j, k, m, n, o, p, q, u, v, w, x


Input: Consider Input: ['1223', 'h', 'a', 'o', 'v', '2535', 'g', '6267', 'w', '9625', '7961', '9577', '7611', '5655', 'p', 'j', 's', '2141', '4101', 'l', '4367', '9383', 'n', '5965', '9097', '7571', 'p', 'u', 'x']

Output: a, g, h, j, l, n, o, p, s, u, v, w, x


Input: Consider Input: ['1709', 'u', 'o', 'y', 't', 'o', 'g', '41', 'a', '7621', 'm', 'u', 'h', '9473', 's', 'b', '1323', '895', '8285', '5215', '2509', 'i', '813', 'm', '783', 's', '8703', '79', 'q', '3899', 'n', '8441', 'y']


Output: a, b, g, h, i, m, n, o, q, s, t, u, y