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: ['6575', '2057', '2135', '6259', '7741', '4919', '7461', 'v', '401', 'h', 'u', '2391', '2181', 'y', '9273', 'd', 'b', 's', '7993', '9323', 'b', '7015']
Example Output: b, d, h, s, u, v, y

Example Input: ['w', '9437', 's', '9819', 'q', 'q', '4443', 'p', '377', '6777', 's', 'x', 'a', 'o', '9205', '9289', '7103', 'k', 'l', '9453', '9043', 'k', 'r', 'g']
Example Output: a, g, k, l, o, p, q, r, s, w, x

Example Input: ['3523', '4059', '4925', '9501', 'd', '7153', '1997', 'o', 'j', '811', '2421', 'b', '8683', '1329', 'l', 'e', 'a', 'v', '147', 'm', 'v', '8513', 'w', '3885', 'w', 'x', 'n', 'i', '1601', 'f', 't', 'b', '8239', '695', 'f', 'i', '2449', 'z']
Example Output:
a, b, d, e, f, i, j, l, m, n, o, t, v, w, x, z

