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: ['5737', 'b', 'e', 't', '7419', 'n', 'y', '5225', '6485', 'b', '1343']

Output: b, e, n, t, y


Input: Consider Input: ['2995', '8179', '8131', '5655', 'j', 'q', 'l', '3193', '1823', 'y', 'n', '7645', 's', '5665', 'r']

Output: j, l, n, q, r, s, y


Input: Consider Input: ['3165', '749', 'r', 'r', 'o', '3241', 'p', 'm', 'l', '7585', 'o', '3047', '8095', '5041', '3079', 'w', 'u', '1719', 'w', '8323', '6349', 'i', 'c', 'h', '8615', '1053']


Output: c, h, i, l, m, o, p, r, u, w