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: ['d', '771', '4193', 'e', '1537', 'a', 'q']
Example Output: a, d, e, q

Example Input: ['r', 'y', 'c', '3211', '9245', '8459', '8521', '5781', 'w', 's', 'd', '5299', 'a', 'y', 'g', 'm', '6435', '8605', 'e', 'h', '6871', 's', '387', 'l', '5829', 'e', 'd', '9545', '2945', 'k', 'v', 't', '8449', '2199', 'm', '2599', '1489', '6623', 'x', 'l']
Example Output: a, c, d, e, g, h, k, l, m, r, s, t, v, w, x, y

Example Input: ['2887', 'w', 'i', '4271', '487', 'c', 'n', 'm', 'q', 'u', '8731', '2723', 'j', 'z', 't', 'u', '7117', 'm', '8419', '3481', '753', '8315', 'f', 'e', '6867', '2343', '9067', 'r', '6543', 'j', '1513', '9749', 's', '3185', '9657', '1467', '8573', 'h', 'a', '9547', '4607', 'w', 'm', 'e', 't']
Example Output:
a, c, e, f, h, i, j, m, n, q, r, s, t, u, w, z