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.

Ex Input:
['e', 'n', 'y', 'f', 'l', 'h', '455', 'y', '591', 'm', '9041', 'b', 'b', 'o', '4215', '5009', 'o', 'a', '4369', 'u', '6911', '4825', 't', 'k', '6063', '2939']

Ex Output:
a, b, e, f, h, k, l, m, n, o, t, u, y


Ex Input:
['f', '3409', 'i', '4147', '1745', '6007', 'l', 'd', 'i']

Ex Output:
d, f, i, l


Ex Input:
['6207', '495', 'f', 'h', 'd', 'g', 't', '7509', 'f', 'x', 'w', '6385', 'b', 'm', 'o', '7573', '3581', 'o', '6343', '1535', 'c', '6781', 'v', 'o', '7737', 't', 'u', 't', '8763']

Ex Output:

b, c, d, f, g, h, m, o, t, u, v, w, x