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: ['9351', 'v', 'h', 'z', 'g', 'f', 't', 'q', 'g', 'o', '4073', 'n', '6149', '1735', '157', 'm']
Example Output: f, g, h, m, n, o, q, t, v, z

Example Input: ['n', 'g', 'u', '2873', 'k', '4411', 'w', '8179', 'w', 'w', 'f', 'g', 'e', '7837', '3055', 'z', 's', '6037', 'n', '1479', 'c', '5311', 'i', 'w', 'z', '1891', '9663', 'y', 'f', 'h']
Example Output: c, e, f, g, h, i, k, n, s, u, w, y, z

Example Input: ['d', 'y', 'q', 'p', '8797', 'h', 'h', 'm', 'p', '9223', 'b', 'd', 't', 'q', 'g', 'k', 'd', '5657', '2415', 'r', 'p', '8683', 'h', 'u', 'j', 'e', '4933', 'c', '865']
Example Output:
b, c, d, e, g, h, j, k, m, p, q, r, t, u, y