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: ['5679', 'd', 'j', 'u', '135', '4887', '9325', '2807', '2867', '4657', '4371', 'w', '6053', '9465', '5715', '5773', 'k', '2247', 'h', 'x', 'n', 't', '117', '7027', '7793', '4031', '2937', '4851', 'l', 'z', 'r', 'y', 'b', '2831', '267', 'k', 'o', '3259', 'g', 'f', '5731', '2833', 'z', 'n']
A: 
b, d, f, g, h, j, k, l, n, o, r, t, u, w, x, y, z