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.

Example Input: ['j', '6675', 'u', 's', '705', '8227', 'f', 'w', 'n']
Example Output: f, j, n, s, u, w

Example Input: ['895', '2049', '8839', '1773', 'v', '467']
Example Output: v

Example Input: ['5427', 'q', '9849', '397', 'o', 'k', '4793', 'v', '5081', '5499', 'z', '855', '8619', 't', '1805', '3715', 'k', '8429', 'u', '3061', 'g', 'h', 'z', 'h', '4013', '9813', 'c', 'f', 's', '6379', 'j', 'b', 'o', 'u', '7399', 't', 'i', 'a', '1721', 'r', 'a']
Example Output:
a, b, c, f, g, h, i, j, k, o, q, r, s, t, u, v, z