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: ['d', '771', '4193', 'e', '1537', 'a', 'q']

Output: a, d, e, q


Input: Consider Input: ['s', '6723', 'l', '1573', '1129', 'n', '4277', '5003', 'y', '7563', 'c', '6747', '3105', 's', '3593', '8417', '8253', '4157', 'w', 'f', 'z', 'd', '9685', '1033', 'h', '4893', 't', 'j', '6821', 'z', 'a', 'u', '591', 'o', '1087', '2147', '1223', '2339', 'i', 'y', '9307', 'x', 'z', 'r', 'y']

Output: a, c, d, f, h, i, j, l, n, o, r, s, t, u, w, x, y, z


Input: Consider Input: ['1597', '2375', 's', '569', 'x', 'i', '4121', 'i', 'i', '5439', '263', '6617', 'f', 'y', '5993', 'k', 'z', 'w', 'o', 'w', 'd', '8445', '8699', '1515', '4349', '8205', '2743', 'b', 'x', 'b', '6527', '3943', '5305', 'r', 'f', 'f']


Output: b, d, f, i, k, o, r, s, w, x, y, z