Detailed Instructions: 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.
Q: ['7295', 'k', 'f', '5235', '5565', 'u', 'p', 'l', 'm', 'c', 'x', '8937', '8857', '8669', 'o', '659', 'n', 'v', 'l', '4475', 'p', '897', 'y', '6967', '1525', '5907', '8497', '6383', '2471', 'h']
A:
c, f, h, k, l, m, n, o, p, u, v, x, y