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]: ['163', 'x', 'g', '5997', 'm', 'l', '7225', '7907', '375', 'y', 'a', 'j', 'c', 'j', '7755', '147', 'h', '3845', 'y', 's', 'h', 'u', '8737', '6091', 'j', 'f', 'c', '7395', '881', '1771', 'y', '3691', 'h']
[EX A]: a, c, f, g, h, j, l, m, s, u, x, y

[EX Q]: ['e', 'c', '4241', '2685', 'o', '9859', 'z', '2647', 'b', 'c', 'y', '1985', '5985', '5709', '6655', 'q', 'z', '9933', '6817', '6477', '1837', 'x', 'p', '9251', '3787', 'v', '5741', 'e', 'p', '493', '5949', '5519', 'v', 'g', '1403', 'z', 'h', 'z']
[EX A]: b, c, e, g, h, o, p, q, v, x, y, z

[EX Q]: ['x', '3531', 'p', '7411', 'y', 'e', '8419', 'v', '7925', '7959', '4817', 'w', 'd', 'o', '3259', '1853', '5441', '9251', 'a', '3997', '6503', 'g', 'v', '6457', '7173', 'r', '1731', '7437']
[EX A]:
a, d, e, g, o, p, r, v, w, x, y