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.

['p', 'f', 'h', '1977', '6221', 'i', 'a', 'l', '5225', '8059', 'c', 'w']
a, c, f, h, i, l, p, w

['g', '8591', '4463', '2189', '7901', '1457', 'f', 'i', '9031', 'r', '5519', '3955', 'd', '2093', 'c', 'y', '6591', '6463', 'h', '4371', '111', 'p', '3221', '4185', 'p', '8761', 'w', 'p']
c, d, f, g, h, i, p, r, w, y

['4299', '6047', '3057', 'y', '1551', 'b', 'x', 'j', 'n', 'u', 'c', '6671', 'g', '529', 'a', '8065', 'n', 'f', '4165', '761', '6829', '7115', '4805', '549', 'q', 'k', '8499', 'k', 'u', '5031', '4811', '5131', 'j']

a, b, c, f, g, j, k, n, q, u, x, y