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: ['f', 'd', '6985', '1801', 'n', '3693', 'y', 'v', '2897', '9469', 'a', 'f', '463', '893', '1673', 'u', 'm', 'g', 'q', 'l', 'h', 'a', '5357', 'u', '5489', 'k', 'm', '6117', 'u', '7335']
A:
a, d, f, g, h, k, l, m, n, q, u, v, y