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: ['7123', 'm', 'h', '4065', 'c', 'n', '187', '3899', 'r', 'k', '2071', '9481', '6277']

Output: c, h, k, m, n, r


Input: Consider Input: ['7823', '2933', 'k', '4139', '5585', 'f', 'c', 'm', '2035', 'q', 'z', 'l', '1999', 'q', 'p', '7291', '2091', 'v', '423', 'e', 's', '6089', '4763', '6739']

Output: c, e, f, k, l, m, p, q, s, v, z


Input: Consider Input: ['8229', '4157', '1679', 'o', '3873', '7627', 'm', '6741', '2587', 'p', 'h', '3821', '3523', '889', '8845', '4727', 't', 'e', 'd', '135', 'b', 'e', 'f', 'z', 'z', '7695']


Output: b, d, e, f, h, m, o, p, t, z