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: ['9117', '1153', 'f', 'b', '9979']

Output: b, f


Input: Consider Input: ['f', 's', 'd', '7483', 'g', 'a', 'z', '435', '8711', '2183', 'b', 'r', 'a', 'n', 's', 'i', 'h', '6431', '4275', '3135', 'a', 's', '3917', 'd', '933', 'd', '2219']


Output: a, b, d, f, g, h, i, n, r, s, z