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.

['l', '7111', 'd', 'e', 'h', 'z', 'x', '5673', 'v', '8255', 'i', 'z', 'c', 'i', '4287', 'q', '9293', '9137', 'p', 'n', 'o', 'n', '7883', '6453', '7355', '8769', 'y', '9153']
c, d, e, h, i, l, n, o, p, q, v, x, y, z

['s', 'w', 'c', '4137', 't', '2437', '349', 'h', '4539', 't', 'b', 'y', 'q', 't', '9087', 'c', '9489', '6285', '6247', '8353', 'n', 't', '8661', 'p', 'z', 'p', '773', 'w', 'q', '8081', 'r', 'u', 'z', 'k', 'a', 'b', '7513', '5549', '5325', '1101', 's', '6507', '3317']
a, b, c, h, k, n, p, q, r, s, t, u, w, y, z

['8749', 'y', '6705', '3025', 'v', '5975', 'c', '1647', 'u', '5479', '6341', '2765', '8251', '3837', 'd', 't', 'c', '8599', 'j', 'x', '3619', 's', '6487', 'f', '7119', 'l', '9825', '3919', 'v', 'x']

c, d, f, j, l, s, t, u, v, x, y