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', 'i']

Output: i, l


Input: Consider Input: ['u', '9249', 'u', 't', 'm', 'm', 'n', 'w', '8617', '2729', 'i', 'l', '2971', '3227', 'b', '9017', '4711', 'i', 't', 'r', 'a', 'a', '1701', '6397', '4535', '9167', '6039', '6111', '849', 'p', '8197', '2645', '5147', 'u', 'l', '7419', 'w', 'w', 'k', 'x', 'c', '3377', '4015', '1297', 'f']

Output: a, b, c, f, i, k, l, m, n, p, r, t, u, w, x


Input: Consider Input: ['c', 'k', '9301', '8547', '7481', 'y', 'x', 'v', '6717', 'j', '4515', '4043', 'u', 'c', 'd', 'r', 'w', '6403', 'm', '89', '3425', 'o', '9783', '7801', 'j', 'f', 'r', 'v', 'h', '2689', 'i', '4515', 'd', '5697']


Output: c, d, f, h, i, j, k, m, o, r, u, v, w, x, y