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', '4165', 'n', 'w', 'n', 'e']

Output: e, g, n, w


Input: Consider Input: ['l', '6819', '1029', '2925', '2361', '5545', '2151', '2681', 'f', 'p', '1263', '2875', 'b', '4665', 'f', 'g', 'p', '4829', '8453', 'z', 'l', '4219', '7517', '25', 'a', '5099', '3693', 'i', '1815', '1541', 'g', '7665']

Output: a, b, f, g, i, l, p, z


Input: Consider Input: ['199', 'b', '7725', 'l', '5347', '3015', '2125', '5081', '3673', 'a', '773', '3369', '7927', '2423', 'e', '4515', '5379', '9453', 'k', 'm', '9563', '7997', '405', 't', '227', 'i', 'a', '565', 's']


Output: a, b, e, i, k, l, m, s, t