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: ['c', 'e', '6509', '1295', 'u', '5445', '1731', '3049']

Output: c, e, u


Input: Consider Input: ['1985', '729', '169', '1299', 'l', 'z', '6809', '3083', 'w', 'f', '1989', 'z', '889', 'x', 'r', '1601']

Output: f, l, r, w, x, z


Input: Consider Input: ['q', '9083', 'c', '5655', '4141', '3765', '4943', '3087', 'w', 't', 'w', '1995', '731', '8539', 'p', '47', 'x', '8165', 'c', 's', 'u', 'i', 'p', '6323', '8145', 'r', '9447']


Output: c, i, p, q, r, s, t, u, w, x