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: ['6027', 'v', 'b', 'l', '7853', 'r', 'y', '2919', '3831']

Output: b, l, r, v, y


Input: Consider Input: ['f', '7573', '2067', 'n', '3671', '7969', '7889', '4893', '6501', 'l', 'y', '4331', 'a', 'e', '2081', '3863', 't', 'j', '7921', 's', '7203', '7797', 'f', '4279', '1299', '987', '5003', '9071', '9559', '6061', '1889', '2653', 'm', 'w', '665', '7343', '9763', 'r', '6343', '9393', '9289']

Output: a, e, f, j, l, m, n, r, s, t, w, y


Input: Consider Input: ['q', 'i', 'w', 'm', 'j', '7243', 'l', 's', 'r', '6807', 'z', 'e', 'p', 'u', 'b', '491', '8609', '7279', 'u', 't', 'k', '1631', '3023', '4819', 'w', 'q', 'a', '8909', 'u', '3853', 'u', '131', 'a', 'k', 'v']


Output: a, b, e, i, j, k, l, m, p, q, r, s, t, u, v, w, z