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: ['4397', '2685', '9539', '4343', '6697', '7693', 'g', 'c', '3587', '4691', 'j', '8931', '7397', '2103', '3431', 'u', 'l', 's', 'v', 'q', 'd', '1289', 'h', '1695', 'h', 'j', 'e', '1225', 'e', '7893', 'o', 'i', '3351']
Example Output: c, d, e, g, h, i, j, l, o, q, s, u, v

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: ['l', '8273', 'm', 'x', '2199', 'q', 'f', 'n', '9171', 'i', 'u', 'u', '6821', 'y', 'm', '6211', '1367', 'k', '1637', 'h']
Example Output:
f, h, i, k, l, m, n, q, u, x, y