Given the task definition and input, reply with output. 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.

['2169', '3233', 'h', 'x', '5155', '2405', '4277', '3295', '4017', '4207', '3863', 'm', '9489', '4835', 'x', '1053', 'x', '5357', '8785', '213', '269', '4819', 'd', '1129', '1961', '7871', '1301', 'n', '7947', '6513', '5493', 'q', '6371', 'o', 'a']
a, d, h, m, n, o, q, x