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: ['g', 'u', 'q', '1375', '9491', 't', 'w', 'c', 'v', 'y', '3169', '1607']

Output: c, g, q, t, u, v, w, y


Input: Consider Input: ['7073', 'd', 'e']

Output: d, e


Input: Consider Input: ['h', 'h', '4869', 'y', '7553', 'l', '2529', '421', 'p', 'm', 's', 'h', 'p', 't', 'o', '3045', '7089', 'h', 'e', '4153', 'r', 'o', '9747', '5975', '2455', '9777', '3241', '2835', '8639', 'v', '7483', 'j', '7979', '2473', 'g', 'a', 't', '1877', 'h', '2139', '1401', '2363', '4847']


Output: a, e, g, h, j, l, m, o, p, r, s, t, v, y