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', '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: ['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: ['3089', '589', 'h', '5963', '2079', '3217', 'r', '2779', '5293', '9517', 's', '155', '799', '2087', '1483', '9447', 'r', '3867', '4213', 'd', '9657', '7453', '5607', 'o', 'c', 'a', '3225', '6347', 'f', 'j']


Output: a, c, d, f, h, j, o, r, s