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: ['7965', '6465', 'c', '7963', 'j', '6839', '9989', '1019', 'x', '1303', '2633', 'y', '6865', 'a', 'k', '635', '3719', '7229', 'k', 't', 'r', '5741', '9569', '4931', '1125', 'f', '5429', 'c', '2065', '6315', 'e', '6877', '2005', 'x', '7831', '7297', 'm', '3571', 'b', '8617', '2981', 'i', '5105', 'g', 'u']

Output: a, b, c, e, f, g, i, j, k, m, r, t, u, x, y


Input: Consider Input: ['4031', 't', 'o', 'c', 'x', '3007', '8329', '6345', '1267', '1017', 'o', 'x', 'l', '4129', 'd', '1987', '487', 'o', 'g', 'j', 'v', 'x', '3983', 'f', 'g', '5759', 'k', 'i', 'o', 'b', 'n', '683', 'j', 'o', 't', '4361', 'u']

Output: b, c, d, f, g, i, j, k, l, n, o, t, u, v, x


Input: Consider Input: ['2417', 'y', 'h', '6839', 'e', '9969', 'i', 'n', '4773', 'x', 'b', '8793', 'p', 'q', '445', 'w', '3287', '8103', 'b', '3437', 'e', '8645', '7097', '4665', '8413', '6745', 'e', 'o', '7987', '9333', '6577', '5495', 'u', 'b', '3369']


Output: b, e, h, i, n, o, p, q, u, w, x, y