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.

['d', '4377', '9271', '8053', '9519']
d

['t', 'u', 'y', 'y', 'b', 'x', 'q', '3713', '2679']
b, q, t, u, x, y

['p', '835', '6849', 'h', '6095', 'i', 'z', 'u', 'g', 'q', '8213', '4539', '9589', '495', '2113', '8097', 'a', 's', '953', '4665', 'k']

a, g, h, i, k, p, q, s, u, z