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: ['1749', 'i', 'w', 'j', '3171', '1999', '1037', '4937', '7013', '3593', '287', 'o', 'i', 'j']

Output: i, j, o, w


Input: Consider Input: ['f', '9203', 'w', 'f', '3751', '8095', '1319', 'f', '3017', 'r', 'y', '8221', '2715', '9959']

Output: f, r, w, y


Input: Consider Input: ['a', '9379', '5301', '7937', '4655', '7569', '8585', 'j', 'a', '1013', '983', '6985', '3249', 'b', 'o', 'd', '8535', '3035']


Output: a, b, d, j, o