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: ['w', 'a', 'm', 'd', '409', 'm', 'v', 's', '7801', 'l', '8551', 'k', '867', 'n', '7731', 'z', '3773', '9137', 'v', 's', 'p', 'p', 'f', 'z', 'g', 'q', 'g', '877', '697', '2057', '8389', '2399', '5263', '2761', '9841', '1781', 'l', '8023']
Example Output: a, d, f, g, k, l, m, n, p, q, s, v, w, z

Example Input: ['g', 'p', '2925', 'n', 'o', 'y', '6381', 'l', '4963', 'g', 'm', 'u', 't', '9389', '3787', '7713', '1251', '779', 'i', 'w', '9869', 'y', 'y', '3881', 'k', 't']
Example Output: g, i, k, l, m, n, o, p, t, u, w, y

Example Input: ['2535', 'g', 'p', 'w', 'c', '3301', '1743', 'u', '3373', '9837', 's', '1213', 'a', '8621', '6057', '7757', '8019', 'g', 'r', '6701', 'l', '6523', '5803', '9997', '4315', 'c', 'i', 'y', 'f', '4113', '2949', 'r', '7975', '8469', '9551', '1039']
Example Output:
a, c, f, g, i, l, p, r, s, u, w, y