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: ['n', '6615', 'r', 'q', '3803', '4641', '9775', '7719', 'n', '6571', '2723', '6919', 'e', 'f', '1919', '6963', '2581', 'y', '713', 'w', 'w', 'w', 'l', 's', '3993', '9563', '9365', '9277', '103', '2737', 'y', '6005', '9763', 'p', '261']

Output: e, f, l, n, p, q, r, s, w, y


Input: Consider Input: ['2459', '3709', 'f', '8673', '9313', 'm', 'd', 'g', 'c', 'g', 'u', 'f', 'p', 'i', '8771', '3613', '9669', '6221', '1211', '8331', '2295', 'b', 'f', 'm', '1377', '9831', '1751', 'k', '4831', 'm', '2747', '3435', '4543', 'c', '1729', 'e', '7093', '397', 'm', '383', '2019']

Output: b, c, d, e, f, g, i, k, m, p, u


Input: Consider Input: ['j', 'a', 'h', '3579', 'n', '9747', 'd', 'e', 'x', 'm', 'f', 'b', '6689', '9303', 'y', '8073', '2975', 'i', 'v', '7389', '3529', 'w', 'l', '9645', 'x', '1135', 'm', '7391', 'o', '4757', '2885', '7489', '6315', 'e', '9667', 'z', '3019', 'g', '1647', 'd', 'w', 'c']


Output: a, b, c, d, e, f, g, h, i, j, l, m, n, o, v, w, x, y, z


