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.

['j', 'a', 'z', 'h', '4129', '4159', 'm', 'o', 'o', '1193', '2905', '3083', 'q', 't', 'm', 'o', '673', '7547', 'n', 'c', 'r', 't', '2897', '4959', 'z', '2377', 'y', '7977', 'u', 'b', 's', 'w', 'e', 'd', '8051']
a, b, c, d, e, h, j, m, n, o, q, r, s, t, u, w, y, z

['k', 'v', 'e', '6377', 'y', '3585', '4535', 'f', 'g', 'm', 'f', '8369', 'v', '7445', '4527', '9383', 'n']
e, f, g, k, m, n, v, y

['u', '8581', 'f', 'k', 'j', 'f', '2755', '2479', 'b', '937', '8341', 'k', 'v', 'w', '7137', '5241', '8003', '3619']

b, f, j, k, u, v, w