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.

Example Input: ['k', 'r', 'f', '4369', 'z', 'z', 'l', '143', 'r', '707', '9167', 'g', '1749', 'i']
Example Output: f, g, i, k, l, r, z

Example Input: ['v', 'd', '3805', '8031', '3327', 'c', 'n', '6153', '2705', 'w', '5675', '6543', 'm', 'v', 'y', 'd', '2943', '4423', '515', '4501', 'y', '9377', 'j', 'i', 'f', '4749', 'o', 'r', '2605', 'm', '117', 'o', '9197', 't', 'l', '4145']
Example Output: c, d, f, i, j, l, m, n, o, r, t, v, w, y

Example Input: ['2887', 'a', 'q', '3179', '7983', 'q', '3065', '4671', '7259', 'a', '7215', 'k', '5261', 'q', '7181', 't', 's', 'b', '9719', '7993', 'z', 'u', 'b', 'y', 's', '2065', '5699', '2889', '3261', 'n', 'q', 'e', 'x']
Example Output:
a, b, e, k, n, q, s, t, u, x, y, z