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.

['e', 'c', '4241', '2685', 'o', '9859', 'z', '2647', 'b', 'c', 'y', '1985', '5985', '5709', '6655', 'q', 'z', '9933', '6817', '6477', '1837', 'x', 'p', '9251', '3787', 'v', '5741', 'e', 'p', '493', '5949', '5519', 'v', 'g', '1403', 'z', 'h', 'z']
b, c, e, g, h, o, p, q, v, x, y, z

['3797', '6117', 'x']
x

['9369', 'j', 'a', '3473', '8395', '7311', 'q', 'f', '3641', 'y', '2563', '7479', 's', 's', 'j', '4305', '5955', 'h', '1395', 't', 'q', '5741', 'y', 'l', '861', 'g', 't', '8801', '9663', '3399', 'r', 'q', 'f', 'a']

a, f, g, h, j, l, q, r, s, t, y