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.

[EX Q]: ['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']
[EX A]: c, d, f, g, h, i, p, r, w, y

[EX Q]: ['1979', 'b', 't', '1101', '7953', '2451', '7539', '6833', 'u', '49']
[EX A]: b, t, u

[EX Q]: ['4689', 's', '9625', 'z', '9859', '913', '3263', 'k', '8091', 'z', 'e', '2169', 'c', '3751', '2331', '9861', 'q', '6249', '4621', 'f', '9603', 'p', '3621', '4809', '5795', 'o', 'i', 'j', 'a', '8169', '1999']
[EX A]:
a, c, e, f, i, j, k, o, p, q, s, z