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: ['i', 'h', '8299', 'e', 'c', '5543', '5241', 'f', '3985', 'f', 'z', '1245', 'e', 't', 'g', '5199', '9217', 'q', 'j', 'p', '767', 'z', '1803', 'k', '7303', '3187', '2507', '6471', '3337', '6037', '9291', 'a', 'l']

Output: a, c, e, f, g, h, i, j, k, l, p, q, t, z


Input: Consider Input: ['i', 'x', 'n', 'w', '8915', 'd', 'd', 'd', '6025', '7861']

Output: d, i, n, w, x


Input: Consider Input: ['4581', '4885', 'o', 'u', 'e', 'e', 't', '987', '3913', '3919', '6769', '6387', 'k', '6397', 'q', '6185', 'p', 'd', '7103', 'p', 's', 'a', '9351', '9701', 'c', 'c', '3609', '3139', 'd', '5317', 'f', 'i', '2657', '5723', 'l', 'r', '4443', 'y', 'p', 'h', '3229', '5363', '1359', '8709', 't']


Output: a, c, d, e, f, h, i, k, l, o, p, q, r, s, t, u, y