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: ['3995', 'n', 'z', '8389', '7857', '3005', 'i', 'e', '1117', 'z', '8251', 'r', 't']

Output: e, i, n, r, t, z


Input: Consider Input: ['7591', '1403']

Output: -1


Input: Consider Input: ['u', 'm', 'v', 'v', '1755', '3753', 'p', '4849', 's', 'w', '3821', '4821', 'i', 'v', 'r', '9183', 'c', '2871', '1943', 'k', '2285', '3135', '6653']


Output: c, i, k, m, p, r, s, u, v, w