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: ['j', '8797', 'i', '5443', 'i', 'f', '7593', 'u', 'h', '3251', 'l', '681', 'y', 'n', 'r', '1699', '1379', '8987', '6955', 'x', 'p', 'x', '553', 'q', '5679', 'q', 'w', '9007', 'r', '8945', '7351', 'a', 'v', 'k', '1309', 'v', 'i', '4161', 'a', 'q', '2919', '6917', '6845']

Output: a, f, h, i, j, k, l, n, p, q, r, u, v, w, x, y


Input: Consider Input: ['5193', 'h', 'm', '703']

Output: h, m


Input: Consider Input: ['5671', '8009', '6913', '8485', 'q', 'c', '1339', 'w', 'n', '3463', 'p', 'z', '7793', '9543', 'p', '2803', 'y', '7949', '4201', '1077', '8355', '3137', 'r', 'v', 'k', 'g', 'g', '9023', '3191', '8839', '3157', 'g', '7423', '6003']


Output: c, g, k, n, p, q, r, v, w, y, z