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: ['j', 'f', '9567', 'f', '7383', 'k', '599', '1091', '1501', 'y', 'o', 'c']

Output: c, f, j, k, o, y


Input: Consider Input: ['8879', 'x', '1383', '4925', '2867', 'j', 't', 'e', 'w', 'p', 't', 'w', 'l', '7447', '1877', '7747', 'k', 'b', 'x', '8565', 'q', '8575', '5711', '2949', '5637', '2197', '4905']

Output: b, e, j, k, l, p, q, t, w, x


Input: Consider Input: ['g', 'n', 'a', '7741', '5925', '3123', '6697', 'c', 'i', '8355', '7537', '1157', 'h', '2695', '9153', '8485', '8657', '7865', 'p', '9873', '8749', 'z', 'l', 'u', 'b', 'v', '1115', 'i', 'k']


Output: a, b, c, g, h, i, k, l, n, p, u, v, z


