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.

Input: Consider Input: ['g', 'h', 'g', 'g', 's', 'h', '2849', '2705', '1185', 'x', '5789', '8221', 'e', 'x', 'g', 'b', '4903', 'q', '1563', 'r', 'k', 't', '9047', 'p', 'p', '9397', 'u', '7473', 'f', 'o', 'y', '1957', '1039', '9905', 'i', '4829', 'q', 'w', 'k', 'p', 't', '563', 'g', 'l']

Output: b, e, f, g, h, i, k, l, o, p, q, r, s, t, u, w, x, y


Input: Consider Input: ['j', '425', '6223', '6631', 'y', '7649', 'r', 'a', '7933', '7947', 'l', 'l', '8755', 'g', 'b', '3351', '49', 'v', 'm', 'x', '3291', '1007', '1401', 'z', 'q', 'a']

Output: a, b, g, j, l, m, q, r, v, x, y, z


Input: Consider Input: ['5835', '763', '3839', 'j', '9713', 'r', 'u', 'b', 'p', 'y', 'f', '4203', 'm', '9239', '6649', 'a', 'x', '7881', '4129', 'y', 'y', 'c', '5287', '3305', 't', '2331', '9861', 'v', '341', '2009', 'u', '271', 's', '6181', 'o', 'd', 'z', '5255', '1729', '2739', 'm', '7961', '1239']


Output: a, b, c, d, f, j, m, o, p, r, s, t, u, v, x, y, z