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]: ['j', 'f', '9567', 'f', '7383', 'k', '599', '1091', '1501', 'y', 'o', 'c']
[EX A]: c, f, j, k, o, y

[EX Q]: ['8451', 'x', '9965', '9303', 'm', 'f', '4205', 'y', 'n', '8521', '9995', 'z', 's', '3519', 'k', 'e', 'o', 'k', '9611', 'q', 'l', 'p', '3339', '4023', 'n', 'd', '8903', 'a', 'k', 'u', '4009', 'e', 'm', '989', '4495']
[EX A]: a, d, e, f, k, l, m, n, o, p, q, s, u, x, y, z

[EX Q]: ['g', '8161', '7331', 'b', 's', 'y', '533', '2595', 'o', 'b', '2627']
[EX A]:
b, g, o, s, y