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.

['c', '4881', '6893', '3729', 'j', '2385', 'q', 'v']
c, j, q, v

['5553', 'f', '3881', '8867', 's', 'd', 'a', '375', '7889', '3949', '2905', 'w', 'q', 'q', 'd', '4203', 'i', '2601', 'y', 'p', 'k']
a, d, f, i, k, p, q, s, w, y

['r', 'q', 'j', 'l', 'q', 'a', '8119', 'c', 'n', '9443', 'c', 'x', '8625', '4973', '4829', '9255', '5733', '4781', '2459', 'e', 'i', '9333', '9135', 'i', 'o', 's', '5527', 'z', 'x', '2381', '6349', '6995', 't', '3939', 'u', '4731', '3163', '2019', 'u', 'u', 'g', 'v', 'v', 'x', 'b']

a, b, c, e, g, i, j, l, n, o, q, r, s, t, u, v, x, z