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: ['6737', 'g', '9985', '5257', 'k', 't', '7863', 'y', '8319', 'l', 'o', '6505', '6531', 'z', '3055', '2943', '3625', 'h', '4867']
Example Output: g, h, k, l, o, t, y, 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: ['253', '2847', 'j', 'b', 'h', '1585', '917', 'o', '4431', 'y', 'k', 'y', '173', 'm', '5393', 'w', '629', '7551', 'i', '401', 'q', '3249']
Example Output:
b, h, i, j, k, m, o, q, w, y