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: ['z', 'm', 'n', 'u', '9159', '7931', '5401', '1383', '8195', 't', 'x', 'q', 'r', '2535', 's', 'j', 'c', '8123', '2429', '5581', 'k', 'c', 't', 'i', 'm', 'o', 't', 'q', '4819', 't', '1649', 'r', 'y', 'z', '8813', '7451', '199', 'o', 'x', 's', 's', '6747']

Output: c, i, j, k, m, n, o, q, r, s, t, u, x, y, z


Input: Consider Input: ['7561', 'r', '3419', 'k', 's', '5997', 'u', '6635', '7003', '8491', 'i', '9835', 'c', '8827', 'h', 'a', 'j', '7675', '1995', '1223']

Output: a, c, h, i, j, k, r, s, u


Input: Consider Input: ['w', '3081', 'w', 'j', '1437', 'v', '9927', '1865', 's', 'k', 'g', '7809', '1383', '4455', '7587', 'k', '969', '7427', 'd', '3965', 'w', '1645']


Output: d, g, j, k, s, v, w