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: ['p', 'p', '7899', 'u', '971', '7289', 't', '5217', 'k', 'z', 'y', 'y', '6905', '9499', '4085', 'x', '955', 'v', 'j', '9049', '7927', '1757', '193', '2181']

Output: j, k, p, t, u, v, x, y, z


Input: Consider Input: ['n', '7337', '6887', '2203', '4663', '2837', '6451', '959', '8027', 'p', 'v', 'q', 'g', '8059', '6151', 'v', '7097', '6583', '7637', '2367', 'w', '9603', '5365', '3773', '1707', 'k', 'x', 's', 'c', 'u', '3641', '6137', '1207', 'k', '5531', '4543']

Output: c, g, k, n, p, q, s, u, v, w, x


Input: Consider Input: ['3123', '5539', 'f', 'a', 'v', 'l', 'l', 'w', 'r', '7735', 's', '1223', '661', 'r', 'c', 'x', 'y', '2699', '3125', '2587', '7453', 't', 'h', 'i', '5647', 'e', '563']


Output: a, c, e, f, h, i, l, r, s, t, v, w, x, y