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.

['r', 'q', '3649', 't', '3941', 'z', '3729', 's', 'g', '6905', 'h', 'v', '1085', '6353', 'a', '9395', '5433', 'a', '2565', 'p', 'a', 'h', '1491', 'j', 'b', 'v', 'e']
a, b, e, g, h, j, p, q, r, s, t, v, z

['y', 'i', '257', '3695', 's', '6717', '4817', '4117']
i, s, y

['x', '6561', 'h', '1203', '3605', 't', 'l', 'i', 'i', 'c']

c, h, i, l, t, x